'I have been to Boston.'
Have/has + past participle makes the present perfect.
She has lost her bag.
They have taken a taxi
I have been to Australia
The present perfect tense is used to describe something that happened in the past, but the exact time it happened is not important. It has a relationship with the present.
I have done my homework = I finished my homework in the past. It is not important at what exact time, only that it is now done.
I have forgotten my bag. = Exactly when in the past that I forgot it is not important. The important thing is that I don't have it now.
As we do not use exact time expressions with the past perfect, we cannot say:
I have done my homework yesterday
In this case we use the past simple tense:
I did my homework yesterday.
Already, just and yet can are all used with the present perfect.
Already means 'something has happened sooner than we expected:
'The movie only came out yesterday, but I have already seen it.'
Just means 'a short time ago':
'I have just seen your brother going into the bank with a gun!'
Yet is only used in questions and negative sentences. It means 'something is expected to happen':
'Have you finished the report yet?'
No, I haven't finished it yet.'
Now choose the best answer to make the present perfect:
