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unDErEstAnD的过去式

understand的过去式和过去分词都是understood.

过去式:understood过去分词:understood

正常情况下,这个句子是I cannot bear it. could 在这里已经是助动词谓语can的过去式了,所以bear 作为动词就不需要过去式了.例如: I didn't see you. 这里的do 是助动词谓语,成了过去式did, 所以see 就不用过去式了.

stand 的过去式是 stood understand 的过去式是 understood========================================================== 如果还有问题,欢迎追问.如果满意请采纳为满意答案.

understand前面有 couldcould 是情态动词,情态动词后要跟动词原形所以underestand 要用原形~~~~~~~~~~~~~~~~祝你进步,如对你有帮助,请及时采纳~~~~~~~~~~~~~~~~

We are usually able to understand well what they say.

Dear John, How are you getting on these days. I am writing to you this time to ask you however I pay my attention to them, I cannot underestand a sentence of them. What

首先我先跟楼主坦白,我语法不好,对于什么语什么从句我一概不知道所以我说的很可能不对,欢迎大家指出来.我觉得按理说应该有统一的时态,但是在陈述客观事实的时候可以用现在时.这句

(1)当a=1时,函数f(x)=x|x-a| 1为f(x)=x|x-1| 1,所以(x)=x,即x|x-1| 1=x,所以x|x-1|=x-1,当x≥1时,x=1,当x

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