Grammar: the present perfect tense (write the complete answer in the negative forms) Example: I have been to Canada twice.

PRESENT PERFECT TENSE :

suj + have o has + verbo participio + complemento

ej.

-I have been to Canada twice. (affirmative)

-I haven't been to Canada twice (negative)

-Have I been to Canada twice?(?)

ej. SHE HAS WORKED A LOT

SHE HASN'T WORKED A LOT

HAS SHE WORKED A LOT?