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I think
it’s a beautiful park .
(1)
She says _____she will leave a message.
她说她将留言。
that
I know _____ your father is a doctor.
that
whether 或if 大部分情况下可以互换，但在以下几种情况下只能用whether.
(2)
只用whether的情况
I don’t know whether he will come or not.
I don’t care of whether he is handsome.
He wondered whether to stay here the next week.
与___________ 连用时
放在__________ 之后
与__________ 连用时
or not
介词
不定式
(3)
I can't understand ______ you said.
我不能理解你说的话。
He wanted to know ______the building
would be set up.
他想知道这座楼房何时建成。
what
when
I hear (that)
Jim ____( be ) a worker two years ago.