3) PASSE PARA A FORMA INTERROGATIVA E PARA A NEGATIVA:
a) They have studied english.
b) I have studied my lessons.
c) I have worked here since 1970.
d) Susan haa studied English.
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a) they haven't studied english.
have they studied english?
b) i haven't studied my lessons.
have i studied my lessons?
c) i haven't worked here since 1970.
have i worked here since 1970?
d) susan hasn't studied english.
has susan studied english?
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