Some day later,he had ___ (leave) for another city.答案给的是to leave,这里是用have to表示必须吗?但为什么是had to呢?___ (take) good care of the plants when I`m out.答案给的是Take,我想请教为什么动词放在句子开头

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Somedaylater,hehad___(leave)foranothercity.答案给的是toleave,这里是用haveto表示必须吗?但为什么是hadto呢?___(take)goodcar

Some day later,he had ___ (leave) for another city.答案给的是to leave,这里是用have to表示必须吗?但为什么是had to呢?___ (take) good care of the plants when I`m out.答案给的是Take,我想请教为什么动词放在句子开头
Some day later,he had ___ (leave) for another city.
答案给的是to leave,这里是用have to表示必须吗?但为什么是had to呢?
___ (take) good care of the plants when I`m out.
答案给的是Take,我想请教为什么动词放在句子开头不使用动名词形式?

Some day later,he had ___ (leave) for another city.答案给的是to leave,这里是用have to表示必须吗?但为什么是had to呢?___ (take) good care of the plants when I`m out.答案给的是Take,我想请教为什么动词放在句子开头
Some day later,he had to leave for another city.
很明显,这是在描述过去的事情.
Take good care of the plants when I`m out.祈使句.前面也可以加please.所以不用ing.

(1)have to表示“必须,不得不”,have的过去分词为had。
(2)take good care of something or somebody,照顾好某事或某事,为固定搭配。

第一题因为是过去时,所以是had to,句中出来"later",一般就表示过去的时间。
第二题是祈使句,也就是直接动词原形。如果用to do不定式,或者动名词,那么这句句子就不完整了。taking good care of the plants when i'm out这句句子没有主谓宾,只有一个状语从句,不成句子。...

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第一题因为是过去时,所以是had to,句中出来"later",一般就表示过去的时间。
第二题是祈使句,也就是直接动词原形。如果用to do不定式,或者动名词,那么这句句子就不完整了。taking good care of the plants when i'm out这句句子没有主谓宾,只有一个状语从句,不成句子。

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1.过去时态
2. 祈使句

Some day later, he had to leave for another city 是过去式 因为Take good care of the plants when I`m out. 是祈使句 所以不用加ing