We also have to be quiet in the library

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We also have to be quiet in the library
这个是书上的原句不是说also出现在情态动词的后面么?

have to不是情态动词只是一种固定用法,also 一般放在动词前
I will also go there
再问：可是书上说是情况态动词啊
再答：只是用法和意义和must相近，然后have to 可以有多种时态，更多的是强调一种被动的含义。可是实际上并不是情态动词。
再问：请问这句子是主系表结构么？
再答：应该不算系表结构，谓语是have have to 和 need to 结构相近，可是need 本身也可做情态动词 you need to go now you need go now

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