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UNIT 5. PRESENT PERFECT SIMPLE
FORM
+
I/ We/You/They have (‘ve) decided
She/He/It has (‘s) bought
–
I/ We/You/They have not (haven’t) decided
She/He/It has not (hasn’t) bought
?
Have I/we/you/they decided? – Yes, I have/No, I have not (haven’t)
Has he/she/it bought? – Yes, she has/No, she has not (hasn’t)
We use present perfect simple
• to describe an event in the past without a definite time.
Someone has broken a window in our c1assroom.
• to describe what someone has completed or achieved in a period of time.
I've finished my homework, and I've c1eaned my room.
• to describe how many things someone has done.
Scientists have found more than 30 unknown insects.
• to describe someone's experiences, what a person has done in life.
I've travelled by plane, but I haven't flown in a helicopter.
• to describe changes, comparing past and present.
Our climate has become much warmer.
We often use time words and phrases with present perfect simple to make the
meaning clear.
just, recently
Someone has just broken a window.
Scientists have recently found more than 30 unknown insects.
ever, never
Have you ever flown in a helicopter? I've never travelled by plane.
already (sooner than expected) : I've already finished my homework. It was easy!
yet (we expect something to happen soon): Have you finished yet?
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