It is demanded that he (should) leave at once.
(4) it + seem/happen/appear等不及物动词+that从句。(look不接that从句,它接to be结构或形容词)
It seems that he is wrong.
It appears that they are in urgent need of help.
He looks (to be) surprised/happy/sad.
2. whether引导主语从句,意为“是否”,只起连接作用,不充当任何成分。(置于句首时必须用whether引导,置于句尾时,间或可用if。)
Whether he will win the game is not clear.
Whether he will come is uncertain.
Whether she comes or not doesn't concern me.
It is not clear whether/if he will come.
It was uncertain whether he would come.
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