Question

否定句到底什么时候用doesn't什么时候用isn't?谢谢！

Answer 1

doesn't
和
isn't
是
does
和
is
的否定词（或反义词），因此
doesn't
/
isn't
的用法和
does
/
is
一样，
也就是说，
He/she/it
doesn't
表达动作，即
他/她/它
"做"
或
“操作”
某某事，通常接动词
而
He/she/it
isn't
表达状态，
即
他/她/它
“是”
某某
东西
或
“处于”
某某状态
，通常接名词，形容词或动词进行时态（现在分词）
例句：
He
doesn't
go
sailing
anymore,
ever
since
his
boating
accident.
He
isn't
a
carefree
person
that
he
used
to
be,
ever
since
the
mishap.
He
isn't
carefree
like
he
used
to
be,
ever
since
the
mishap.
With
the
memory
of
the
accident
still
fresh
in
mind,
he
isn't
going
sailing
much.