called 为什么要加ed?．天气没有出现好转的迹象,所以政府号召我们做好防洪的准备.The weather showed no signs of getting better so the government called upon us to get prepared for floods.

来源：学生作业帮助网编辑：作业帮时间：2024/05/09 18:34:57

called 为什么要加ed?．天气没有出现好转的迹象,所以政府号召我们做好防洪的准备.The weather showed no signs of getting better so the government called upon us to get prepared for floods.
called 为什么要加ed?
．天气没有出现好转的迹象,所以政府号召我们做好防洪的准备.
The weather showed no signs of getting better so the government called upon us to get prepared for floods.

called 为什么要加ed?．天气没有出现好转的迹象,所以政府号召我们做好防洪的准备.The weather showed no signs of getting better so the government called upon us to get prepared for floods.
这句话中动词都加上了ed,这就表示是过去发生的事,所以call也不例外,过去试

表示过去式，过去的动作。 showed用的过去式

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英文中有连词conj.，典型的像and, or ,but 这一类的，连词连接的一个句子前后事态（过去式/将来时/进行时/完成式）要一致。
在这个句子中，so作为连词，它所连接的句子前后事态要一致，前面是showed过去式，因而后面call也需要用过去式加ed。除连词外，还有从句等要求时态一致。
但是有一点需要注意，如果句子前后出现既定事实，如地球绕着太阳转-_-!之类的，就保持该句时态不变。eg. My teacher told us that the earth goes aroung the sun. 这是一个从句，由that连接，told-goes。
(但要注意，既定事实其实是指被广泛认知的真理。如一个人的名字是既定不变的，但这不是被人们所认知的真理，eg.I sat next to a girl whose name was Diane引导词为whose，sat-was)
听上去很绕，我当时学的时候也花了很久才弄懂，多练题，多总结，祝好运。

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