Unit 2: Tenses

I. Orientation

English tenses locate actions in time and show whether an event is repeated, continuing, completed, or expected. The three broad time references are present, past, and future; each can be expressed through simple, continuous, perfect, and perfect continuous forms.

• Time reference: Present relates to now or regular time; past relates to an earlier time; future relates to a time after now.
• Aspect: Simple presents facts or complete events; continuous presents temporary or ongoing activity; perfect connects an earlier event with a later time; perfect continuous emphasizes duration.
• Auxiliary verbs: Be forms continuous tenses, have forms perfect tenses, and will commonly forms the future.
• Verb agreement: In the present simple, he, she, and it usually take -s or -es: She works.
• Time expressions: Usually commonly accompanies present habits, yesterday past events, and tomorrow future events.
• Negative and interrogative forms: Auxiliary verbs usually carry not in negatives and move before the subject in questions.

II. Present Tenses — Present time, habits, and developing situations

Present tenses describe facts, routines, actions happening around now, and situations extending from the past into the present. The main forms are present simple, present continuous, present perfect, and present perfect continuous.

A. rules

The main rules determine which present form is appropriate and how the main verb behaves.

• Present simple agreement: Add -s or -es after he, she, or it: He watches television; change consonant + y to -ies: She studies.
• Third-person exceptions: Have becomes has, do becomes does, and be becomes is: She has a car.
• Stative verbs: Verbs such as know, believe, own, and understand are normally not continuous: I understand the rule, not usually I am understanding the rule.
• Present perfect reference: Use since for a starting point—since Monday—and for for a duration—for three days.
• Unfinished time: Present perfect can refer to a period that includes now: I have read two articles this week.

B. usage

Present forms express different relationships between an action and the current moment.

• Present simple: Use it for routines, permanent facts, and timetables: Water boils at 100°C; The train leaves at 8:00.
• Present continuous: Use it for an action in progress or a temporary situation: They are discussing the proposal now; I am staying with relatives this month.
• Present perfect: Use it for a past action with a present result or unspecified time: She has lost her keys means she cannot use them now.
• Present perfect continuous: Use it to emphasize duration or repeated activity continuing to the present: He has been studying for two hours.
• Future arrangement through present continuous: A fixed personal arrangement may use the present continuous: We are meeting the director tomorrow.

C. formation

Present forms use different auxiliary patterns and verb forms.

• Present simple:
  
  TEXT

    Affirmative: Subject + base verb (+ s/es)
    Negative: Subject + do/does not + base verb
    Question: Do/Does + subject + base verb?

  
  Does marks the third person, so the main verb returns to its base form: Does she work?
• Present continuous:
  
  TEXT

    Subject + am/is/are + verb-ing

  
  Example: They are preparing the report.
• Present perfect:
  
  TEXT

    Subject + have/has + past participle

  
  Example: He has completed the task.
• Present perfect continuous:
  
  TEXT

    Subject + have/has been + verb-ing

  
  Example: We have been waiting since noon.

III. Past Tenses — Completed, continuing, or earlier past events

Past tenses locate events before the present. Past simple normally presents a completed event, past continuous describes an activity in progress, past perfect shows an earlier past event, and past perfect continuous emphasizes duration before a past point.

A. rules

Past-tense selection depends on completion, sequence, and duration.

• Regular past forms: Add -ed: work → worked. Spelling changes include study → studied and stop → stopped.
• Irregular past forms: These must be learned individually: go → went, take → took, and write → wrote.
• Past simple questions and negatives: Use did plus the base verb: Did they arrive? and They did not arrive, not Did they arrived?
• Past continuous agreement: Use was with I, he, she, and it, and were with you, we, and they: She was reading; they were reading.
• Sequence of events: Use past perfect when one past event clearly occurred before another: The film had started before we arrived.

B. usage

Past forms show whether an event was complete, in progress, or earlier than another event.

• Past simple: Use it for completed events at a definite past time: The company opened a branch in 2020.
• Past continuous: Use it for an activity in progress at a particular past moment: At 7 p.m., I was travelling home.
• Interrupted activity: Combine past continuous with past simple: I was cooking when the phone rang. The cooking was in progress; the ringing interrupted it.
• Past perfect: Use it for the earlier of two past events: They had left before the meeting began.
• Past perfect continuous: Use it for duration before a past point: She had been working there for five years when she resigned.

C. formation

Past constructions use did, be, or had according to the tense.

• Past simple:
  
  TEXT

    Affirmative: Subject + past form
    Negative: Subject + did not + base verb
    Question: Did + subject + base verb?

• Past continuous:
  
  TEXT

    Subject + was/were + verb-ing

• Past perfect:
  
  TEXT

    Subject + had + past participle

• Past perfect continuous:
  
  TEXT

    Subject + had been + verb-ing

IV. Future Tenses — Predictions, intentions, arrangements, and completed future events

Future meaning is expressed through several structures rather than one single tense. Will, be going to, present continuous, present simple, future continuous, future perfect, and future perfect continuous each emphasize a different relationship with future time.

A. rules

Future forms are selected according to evidence, intention, arrangement, or duration.

• Will: Use will + base verb for spontaneous decisions, promises, offers, and predictions: I will help you.
• Be going to: Use it for prior intentions or predictions based on present evidence: She is going to apply for the job; Those clouds are going to bring rain.
• Present forms for future: Use present continuous for arrangements—We are flying on Friday—and present simple for schedules—The lecture starts at nine.
• Future perfect reference: Use by with a deadline: By June, they will have finished the project.
• Time clauses: After when, if, before, and as soon as, use present forms for future meaning: When he arrives, we will begin, not usually When he will arrive.

B. usage

Future constructions distinguish prediction, arrangement, progress, and completion.

• Future simple: Will expresses a prediction or decision made at speaking time: The results will be available tomorrow.
• Future continuous: Use it for an activity in progress at a future moment: At this time next week, I will be attending a conference.
• Future perfect: Use it for an action completed before a future deadline: By Friday, she will have submitted the form.
• Future perfect continuous: Use it to emphasize duration up to a future point: In July, he will have been teaching for ten years.
• Polite inquiry: Future continuous can sound less direct: Will you be using the meeting room this afternoon?

C. formation

Future forms combine auxiliaries with the appropriate participle.

• Future simple:
  
  TEXT

    Subject + will + base verb

• Future continuous:
  
  TEXT

    Subject + will be + verb-ing

• Future perfect:
  
  TEXT

    Subject + will have + past participle

• Future perfect continuous:
  
  TEXT

    Subject + will have been + verb-ing

D. imperative negative

The negative imperative gives an instruction not to do something.

• Basic formation: Use do not or the contraction don’t plus the base verb: Don’t touch the equipment.
• With “be”: Use Don’t be plus an adjective or noun phrase: Don’t be careless.
• Formal warning: Do not enter is more formal than Don’t enter, especially on signs.
• Emphatic prohibition: Never can strengthen the instruction: Never remove the safety cover while the machine is running.

V. Tense Comparisons — Choosing between related time references

Tense comparison prevents speakers from treating all past, present, or future actions as equivalent. Meaning depends on time markers, completion, duration, and connection with another event.

A. comparison of present, past and future tenses

The three time references differ in their relationship to the speaking moment.

• Present: Describes current or habitual reality: She works in Nairobi indicates her present situation.
• Past: Describes completed or earlier reality: She worked in Nairobi in 2022 places the situation in a finished period.
• Future: Describes expected or planned reality: She will work in Nairobi next year places it after now.
• Continuous contrast: He writes reports describes a habit; he is writing a report describes an activity in progress; he was writing a report places that activity in the past.
• Perfect contrast: She has finished connects completion with now; she had finished connects completion with a later past event; she will have finished connects it with a future deadline.

B. comparison of present perfect or past simple

Present perfect and past simple both refer to past actions, but their time perspective is different.

• Present perfect: Use have/has + past participle when the result or experience connects with the present and no finished time is stated: I have visited Kigali.
• Past simple: Use the past form with a finished time expression: I visited Kigali in 2019.
• Time-marker rule: Do not normally combine present perfect with yesterday, last year, or in 2019: say I saw him yesterday, not usually I have seen him yesterday.
• Experience versus specific event: Have you ever used this software? asks about experience; When did you use it? asks for a definite past occasion.
• Worked example: The manager has approved the plan emphasizes its current status; The manager approved the plan on Monday identifies a completed event at a finished time.

C. comparison of past perfect or past simple

Past perfect and past simple are compared when two events belong to the past.

• Past simple alone: Use it when the sequence is already clear: She entered the room and sat down.
• Past perfect: Use had + past participle to make the earlier event explicit: She had entered the room before the discussion began.
• Chronological order: The first event takes past perfect and the later event takes past simple: The plane had departed when we reached the airport.
• Avoid unnecessary use: Do not use past perfect merely because an event is in the past; it needs a later past reference or a clear backward connection.
• Worked example: After I had checked the figures, I sent the email clearly marks checking as earlier and sending as later.

VI. Question Tags — Confirmation and agreement

A question tag is a short question added to a statement. It normally uses the same auxiliary and tense as the statement, with opposite polarity.

A. question tags of present, past, and future tenses

Tags reflect the tense and auxiliary of the main clause.

• Present simple: Use do/does: You like jazz, don’t you?; She works here, doesn’t she?
• Present continuous: Repeat am/is/are: They are leaving, aren’t they?
• Present perfect: Repeat have/has: He has finished, hasn’t he?
• Past simple: Use did: They arrived early, didn’t they?
• Past continuous: Repeat was/were: She was sleeping, wasn’t she?
• Past perfect: Repeat had: You had met him, hadn’t you?
• Future with will: Repeat will: We will need more time, won’t we?
• Future with going to: Repeat the form of be: She is going to present the report, isn’t she?
• Polarity: A positive statement normally takes a negative tag—He is ready, isn’t he?—while a negative statement takes a positive tag—He isn’t ready, is he?
• Special form with “I am”: The usual tag is aren’t I?: I am responsible, aren’t I?
• Pronoun agreement: The tag subject must match the statement’s subject: Maria called, didn’t she? not didn’t Maria?