This document discusses the present perfect tense in English. It covers the structure, auxiliary verbs, subjects, and uses of the present perfect tense. Specifically, it explains that the present perfect tense is used for actions that occurred in a specific time period not defined as completed before now. It provides examples of affirmative, negative, and interrogative sentences using the present perfect tense with the verbs "to go" and "to be".

1. Present Perfect
Angie Marcela Barreto
Nicolás Daza
Anderson Suarez 

2. I, you, we, they
Auxiliary
Have
She, he, it Has
+ -
Haven’t
Hasn’t

3. Estructure
Afirmative:
Subjet+ auxiliary verb (has or have) + past participle
Negative:
Subjet+ auxiliary verb (hasn’t or haven’t) + past participle
Interrogative:
Auxiliary verb (has or have) + subjet+ past participle +

4. Uses:
the perfect present for actions that occurred in a specific
time not used before now
Examples:
• +She has gone to work
-She hasn’t gone to work
?Has she gone to
• +We have been to London.
-We haven’t been to London
?Have we been to London