问题 情态动词have to怎么有人称、数、时态的变化

老师你好！请教：情态动词没有人称、数、时态的变化，那情态动词have to怎么有人称、数、时态的变化呢?

问题 doing 还是to do

1.it is a waste of time/pleasure/fun/use/good doing2. there is no point /sense/harm/use/good doing sth以上两个结构中doing可以改为to do 么？有there is no hurry/need doing 的结构么，看到语法书里有这样的总结，有点乱。谢谢！

问题 如何理解翻译 coiffed short to look Western

The oiled black hair, though, coiffed short to look Western, was convincingly modern.

问题 be linked to在句中算啥成分

Exercising for just 10 minutes, a week is linked to a longer life.请问如何划分句子结构，属于哪种基本句型？

问题 will do 与 want to do 的区别

I will do it.I want to do it.这两句的本质区别是什么？

问题 To do用法

不定式后置定语其逻辑主语是句子中的主语吗？我在答疑网上看到了两种不同的答案。还请老师帮忙指正

话题 关于"prefer not to"的疑问

话题 have to do的否定形式

话题 be to do的结构用法

话题 to do和doing的区别

话题 关于to have done的疑惑

话题 to do 不定式的功能

话题 having 和 to have 的区分

话题 to do 不定式的否定

问题 miss to be done与miss being done的区别

The squirrel was so lucky that it just missed ______.A. catchingB. to be caughtC. being caughtD. to catch答案是 C，我想选 B，因为松鼠没被抓住呀。谢谢老师帮助。