it is very important for us to be in a good mood中为何用to be.it指代什么?

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it is very important for us to be in a good mood中为何用to be.it指代什么?
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it is very important for us to be in a good mood中为何用to be.it指代什么?
it is very important for us to be in a good mood中为何用to be.it指代什么?

it is very important for us to be in a good mood中为何用to be.it指代什么?
it is + 形容词+不定式(to do / be) 固定句型
for sb 表示动作发出者
句子主语是不定式的句子,而把形式主语it提到句子最前
所以it 指代to be in a good mood

TO BE 不定式是真正主语,IT 指代真正主语,是形式主语

be in a good mood 该算作一个词组,It 指后面的 be in a good mood.学习外语不用那么扣文嚼字,就像你说中国话一样,说话之前,还要考虑哪个是主语,哪个是动词,然后再把一句话说出来吗?语感很重要,多读多听。