to在这句的用法It's important to save energy and to reduce waste gases.这句话中,and后的to为什么要有,在这是什么用法?

to在这句的用法It's important to save energy and to reduce waste gases.这句话中,and后的to为什么要有,在这是什么用法? 英语 It's thought to be a plant originally African.请问,originally在这句里面是什么用法啊,怎么没见过副词这样用的啊? it's +形容词+to do的用法 it's not a big deal to/for me.to 和for的区别to和for 的用法老混淆,就比如这句,该用to还是用for?it's not a big deal to/for me. take care of 的用法They are too difficult to take care of .It's east to take care it.两句有什么区别?it 什么时候用什么时候不用?第二句是It's easy to take care of it. 有没有It's no good to sth的用法 i think it better to work it out by ourselves.此句可不可以说i think it's better to work it out by ourselves .题目中的it是形式宾语,请问it用做形式宾语的用法. It's的用法比如It's up to you.由你决定为什么没有决定这词It's 可以代替哪些词啊 It's time for...和It's time to 的用法和区别? It's fun to do和It's fun doing的用法 It's fun to do和It's fun doing的用法,具体一点,要有例句. It's nothing的用法~ It's taken.的用法 这句英语的用法是怎样的?对白为：-Why don't you take off your jacket?-I'm uesd to it.第二句的uesd to it.这个是什么用法?固定短语?简便用法? it's time to和it's time for的有什么不同?it's time to和it's time for的用法有什么不同 He's got a smile that's to die for.这句后面的that's to 是个什么用法.THAT不是引导从句吗?为何是THAT'S .That's后面加TO又是什么用法? it's和it's a的区别用法,还有a用在哪里 I think it easy for me to learn English.着是宾语从句,it 是think的宾语,后面是从句,怎么没动次呢?固定用法是it's+adj+...那么可以在这句话中加is了