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esercizio 1 - capitolo review units 11-12
Answers:
the
present perfect
is composed of two elements: (b)
the present tense of
have
+ the
past participle
of the main verb
.
we use the
present perfect
for actions that happened (b)
at an unspecified time
.
we also use the
present perfect
to talk about actions that happened (a)
within the last few moments
.
(a)
ever, never, just, already
and
yet
are signal words of the
present perfect
.
yes
is used in (b)
interrogative and negative sentences
.
we use
have/has been to
to refer to someone who (b)
went to a place and has already returned
.
after
it's the first time
we use (b)
the
present perfect
.
we use
must
for (a)
a self-imposed necessity or obligation, written instructions and orders
.
mustn't
expresses (b)
prohibition
.
we use
needn't
to express (a)
absence of obligation to do something
.