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Some day later,he had ___ (leave) for another city.

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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 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.
再问: 那么Some day later是什么意思呢?
再答: 几天后,day应加s