Present Perfect Simple/Present Simple

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We use the Present Perfect Simple to say that an action happened at an un specific time before now.

The exact time is not important. You cannot use the Present Perfect with specific time expressions such as: yesterday, one year ago, last week, when I was a child, when I lived in Japan, at that moment, that day, one day, etc. We can use the Present Perfect with unspecific expressions such as: ever, never, once, many times, several times, before, so far, already yet, etc.

We only use the verb to have (haber). We use have or has in present:

Subject + have/has + Past participle + Complement

Positive = I have eaten a pizza

Negative = I haven't (or have not) eaten a pizza

Interrogative = Have I/you eaten a pizza?

FOR AND SINCE:

For and Since are time expressions

We write them at the end of the sentence

Subject + have/has + Past Participle + Complement = since/for + .....

For (durante): Periods of time. Example: for five years

Since (desde): oints in the time. Example: since 1987

Formation:

Positive: Subject + verb in infinitive + complement

Negative: Subject + don't/doesn't + verb in infinitive + complement

Interrogative: Auxiliar verb (do/does) + Subject + verb infinitive + complement.

Present Perfect Simple

Present Simple