为何在英语句子,是TO stay healthy ,而不是Staying healthy?

为何在英语句子,是TO stay healthy ,而不是Staying healthy? hea 英语 my mother being ill ,she had to stay home to look after her .这里的 为什么 要用being ill,is ill 不行吗,还有 had to 在句子里是什么成分是和stay合起来做谓语吗? 下面的题目是用括号里所给的单词的适当形式填空.有没有人可以告诉我1.What about the medicine she “gives”（give）you 2.It's easy to go (go) there by airplane3.She shouldn’t work any more “to stay”（stay） hea Do you wish me to stay?句子中为什麽要加 to? 这话是一个美国男生对女生说的,里面 try to eat right I'm very passionate in all areas of my life.I am very responsible and try to eat right,workout and live a healthy life.I stay active and have a good time doing it.I believe in a hea 英语翻译以下为歌词：I feel it's changing,I stay the sameI'm...a solo cello outside a chor-usI've got a secretIt's time for me to tell that you've been keeping me warmJust sweet beginnings and bitter en-dingsIn coffee city,we borrowed hea-ve 如何在英语句子中找动词?为什么I love you中love是动词? how to stay safe online英语作文 英语作文：How to stay good spirits how to stay healthy英语作文 英语补全句子：和朋友们在一起对这个男孩有好处.（ ）to stay with his friends. 是stay up to do还是stay up doing 英语翻译I am looking forward to you coming to stay with us.句子的结构是怎么样的? 英语中逗号It began to rain ,so we had to stay here.It began to rain so we had to stay here.这两个句子哪个对啊?为什么?在什么情况下,连词前面加逗号呢? 求英语文章：the way to stay healthy最好是有出处的 英语短文改错：They would rather let their children to stay at home .They would rather let their children to stay at home .我知道是将stay前的to去掉,但是求原因、 把词组成句子 where.to tell stay.people