新概念英语中why have we reason to be grateful to insect-eating ani

新概念英语中why have we reason to be grateful to insect-eating animals?是什么语法?...检举 | 今天 11:14 ecprofessional | 浏览次数：17次
新概念英语中why have we reason to be grateful to insect-eating animals?是什么语法?有why have 这个句型吗?如果有怎么用?
答：这不是新概念英语的原句.
新概念第四册自学导读 Lesson2
Comprehension 理解
Give short answers to these questions in your own words as far as possible．Use one complete sentence for each answer.
1 Why have we reason to be grateful to insect-eating animals?
2 How can we tell the difference between a spider and an insect?
3 What do you understand by the statement‘One authority on spiders made a census of the spiders in a grass field…’?(11.9-10)
这第一句话是：We have reasons to be grateful to insect-eating animals.的特殊疑问句.
当have作有解时,英国英语可以简单地将have 提前构成疑问句如：Have you a pen?
当然,更常说的是Have you got a pen?
或用美国英语：Do you have a pen?
感觉这句话中的reason应用复数.

上面的句子相当于：
Why do we have reason to be grateful to insect-eating animals?
道理是这样的：
Why do we have reason to be grateful to insect-eating animals?（属于口语的用法）
Why have we reason to be gratef...

这是新概念几的？个人感觉这个句子不对呀。