Why
not
do
sth.=Why
don't
you
do
sth.=you'd
better
do
sth.
这是疑问句的形式
祈使句的含义
否定的形式
肯定的请求
Why
not
do
sth.？
=Why
don't
you
do
sth？
=What
about
doing
sth?
=How
about
doing
sth?
=Let's
do
sth.
=Shall
we
do
sth?
这些句子都用于提建议。
希望能帮到你，祝你开心。
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