English Grammar Essentials: Tenses, Clauses and Usage
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Present Perfect
Used for actions that started in the past and continue into the present.
- I / You / We / They: Have + 3rd column (past participle)
- He / She / It: Has + 3rd column (past participle)
Negative:
- I / You / We / They: Have not + 3rd column
- He / She / It: Has not + 3rd column
Interrogative:
- Have + I / You / We / They + 3rd column?
- Has + He / She / It + 3rd column?
Past Simple
Used for specific actions that began and ended in the past. Commonly used with time adverbs like last year, yesterday, or last night.
- Affirmative: Subject + Verb (-ed)
- Negative: Subject + Did not + Verb
- Interrogative: Did + Subject + Verb?
Relative Clauses
- Who: People (Subject)
- Whom: People (Object)
- Whose: Possession (animals, people, or things)
- Which: Animals or objects
- That: People,