1. THE PRESENT PERFECT SIMPLE TENSE Affirmative Negative Questions
I/We/You/They have seen.
He/She /It has seen. I/We/You/They haven’t seen.
He/She /It hasn’t seen. Have I/ We / You / They seen?
Has He / She / It seen?

We use the Present Perfect Simple Tense for
• Something that started in the past and has continued until now.
Pam has studied in this school for 8 years.
• Something that happened in the past but we don’t say exactly when (or the time is not important)
Biologists have found new marine species.
• Something that happened in the past and has a result that effects the present.
Everyday diet and exercise have helped her to lose her weight.
• Actions that have just finished
I have just written my project.
• Experience and achievements
She has been to many countries.

Common time expressions used with the Present Perfect Simple: already, just, ever, never, since, for, recently, so far, once, twice, three times, until now, yet.​

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