it is 跟动词ing 还是to do

it is 跟动词ing 还是to do？

It's adj+to do sth.

在这个句型中,it是形式主语,代替后面的动词不定式.

例如：It's important to learn English well.学好英语很重要.

①it is fun to do sth

It could be fun to watch them play.看他们玩会很有趣。

It’s fun to ski down a mountain.滑雪下山很有趣。

It's fun to be in a large city at Christmastime.大城市圣诞节期间非常好玩。

It is more fun to go with someone than to go alone.偕伴同去比自己独自去好玩。

②it is fun doing sth

It’s fun working for him.为他工作很有意思。

It’s no fun eating on your own.一个人吃饭没意思。

It’s fun being taken to the zoo.被带去看动物园真有意思。

It’s not much fun going to a party alone.独自一人去参加聚会没什么意思。

It’s no good/use… -ing and It is worth …-ing.常用-ing, 其他时候为非正规表达。1) It’s no good talking to him – he never listens.2) It’s no use expecting her to say thank-you.3) It’s no use trying to explain – I’m not interested.

is 后面的动词 不一定要用 ing 形式,要具体情况具体分析的呢 当为be+to do 为将要做某事,或是祈使句 在此What you've got to do is turn around and say : Watch me.为一句祈使句,口头用语呢 turn around and say 是前面what you've got to do

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It is后面既可以跟动词的ing形式 也可以跟动词不定式to do 。但是后面跟ing形式和动词不定式 所表达的内在意义不一样 ，后接动词的ing形式时 表达现在 进行时态 ，强调动作 正在进行或发生，而接动词不定式时 表示将来的动作 。如：It is raining outside 。 外面正在下雨 ？

It's to rain tomorrow according to the weather report