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