The Present Perfect Tense is used to express an action that took place in the past but has a connection with present situation (there is a result at present).
Example: She has studied well (so she can answer the question correctly).
Compare: She studied well last night (we emphasize on the time it happened).
FORMS
- Affirmative (Subject + have/has + Verb3)
Example: I have done my homework already.
- Negative (Subject + have/has not + Verb3)
Example: I have not done my homework yet.
- Question (Have/Has + subject + Verb3 ?)
Example: Have you done your homework yet?
Adverbs of time:
already, yet, for, since, once/twice, just, ever, never, recently/lately, so far/up to present/ up to now
Note:
- Already is used in affirmative sentence.
- Yet is used in negative and interrogative sentence.
- Ever is commonly used in interrogative sentence.
- Since ---> from that time to time of speaking.
- For -----> the length of time.
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