Question

Complete
We use the present perfect to say that an action happened at an______
before now. The exact time is______The present perfect is formed from
the_____of the verb______and the_____
of a verb.
a) specified time; very important; present tense; to be; past participle,
b) unspecified time; not important; present tense; to have; past participle,
c) understand time; very important; past tense; to have; present perfect.
d) unspecified time; important; present tense; to has; past participle,
e) unspecified time; not important; future; to have; past participle.​

Answer 1

Resposta:

b)

Unspecified time

Not important

Present tense

To have

Past participle