英语语法,请问这里为什么用to?It's good for your health to eat an apple every day.请问老师这里为什么用 to eat

英语语法,请问这里为什么用to?It's good for your health to eat an apple every day.请问老师这里为什么用 to eat It usually takes me twenty minutes to have a meal.请问这里的take为什么加s it's high time that we did sth.这里为什么要用虚拟语气?it's time to do sth,这里为什么不用虚拟? It's right here-right next to Beijing University.这里为什么要用连词符号? 英语语法题 用括号内单词的适当形式填空 Be _______(quick).It's time to go to school.为什么答案是quick而不是quickly? 问一句英语语法问题It is impolite to break into other people's house without kenockingat the door请问kenocking为什么要加ingmust we return this book this weeked请问this weeked前为什么不要加in 可以in吗? It's a week since he went to BeiJing.请问 这里It's是不是指It is? That's why it's important to learn a second language.在这里second前面为什么用a 单项选择：It's very kind____you to invite me for dinner.A.for B.of这里可否用It's+adj+for+sb+to do结构?为什么? 请问句型It's known to us that从句是被动语态吗?请问句型It's known/well-known to us that从句,是被动语态吗?若是,怎么这里用TO US,不用BY US? It's ten years ago ____ I came to this town.这里填的是that.请问为什么不填before? It's terribly cold today.、这里为什么用terribly 英语语法 动名词.It's no use telling him about.tell为什么用动名词. 英语语法：It's time to do..和 It's about time to do..的区别是什么 It is time (to watch)CCTV news.请问这里为什么要加to呢? also ,it's rude to put your hands in your lap.这里为什么用in 到底怎么翻译? it’s exciting to spend time ( playing ) in the snow with friends.这里为什么要用playing 英语语法：is it worth the risk?请问这句话有没错误 worth这里作adj?我怎么觉得是to