初中阶段语法:
must
,情态动词,一是可以表示必须,后面跟动词原型。如We
must
keep
quiet.
二是可以表示肯定,后面往往跟be动词。如She
must
be
our
new
teacher.
三要注意否定式mustn't不是“不必”的意思,而是不准,不许。比如We
mustn't
talk
in
class.
意思是我们不可以在上课时讲话。
四要注意用must
开头提问,肯定回答用must,
否定回答用needn't或don't
have
to
如Must
I
finish
my
work
today?
Yes,
you
must./No,
you
needn't