Grammar Reference

Verbs

Present perfect

In the following sentence has collected is an example of the present perfect.

The present perfect is formed like this: auxiliary verb have + past participle

Affirmative and negative

I/You/We/They

have (not) seen the film.
He/She/It has (not) seen the film.

Question

Have

I/you/we/they seen the film?
Has he/she/it seen the film?

The present perfect is used to talk about:

-situations which started in the past and continue now.

-experiences at an indefinite time in the past.

The present perfect is used with expressions of unfinished time. Unfinished time started in the past and continues into the present.

The past simple is used with finished time; when there is no possibility of something happening again in that time period.

Note:

Sometimes an expression that usually refers to unfinished time can be used with the past simple tense.

For example:

I received 40 emails this morning! Luckily, I have only received three this afternoon.

The speaker is talking in the afternoon so, for her, this morning is finished time.