can、would、ought、might在用法上有什么区别？ought的否定句式怎么做？

Question

如题所述

Answer 1

can
表示能，I
believe
I
can
fly.
would
表示想要，I
would
like
to
do
sth.；
引用他人讲话从句部分表示“将会”的内容，He
said
that
he
would
be
back
in
ten
minutes；
疑问句中询问他人，Would
you
mind
close
the
window?
ought
表示应该，You
ought
to
scrap
the
old
bike
and
buy
a
new
one.
might
最礼貌了，表示可以：May
I
leave
now,
Sir?

Answer 2

can
表示能，I
believe
I
can
fly.
would
表示想要，I
would
like
to
do
sth.；
引用他人讲话从句部分表示“将会”的内容，He
said
that
he
would
be
back
in
ten
minutes；
疑问句中询问他人，Would
you
mind
close
the
window?

Answer 3

Can
you
speak
English?
一般常用表能否
Would
you
like
to
give
me
a
piece
of
cake?委婉的请求
You
ought
to
go
the
party,It
must
be
funny!
应当，表愿望，责任，可能性
Might
I
express
my
opinion?
我可以发表意见吗?可以：用于表示较为恭敬或礼貌，较may，ought
或
should
委婉：