The document discusses the present perfect tense in English. It is used to express past actions that are still ongoing or have effects in the present, repeated actions that may have occurred multiple times up to the present, and can be formed negatively or interrogatively. Keywords that are often used with the present perfect include yet, ever, many times, recently, and lately.

1. PRESENT PERFECT
It is used to express:
- past actions carrying on in the present:
He has started a new book but he has not finished it yet
- repeated actions:
He has been to Rome for three times
- effects which are still visible :
Look at all the pieces: she has broken the glass!

2. PRESENT PERFECT
Forma negativa:
I haven't been there recently
It hasn't rained enough because the land is dry
Forma interrogativa:
How long have you been in Paris?
Have your parents told you all the truth?

3. PRESENT PERFECT
Keywords:
- yet
- ever
- many times
- recently
- lately