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getting married costs a lot,getting devorced costs much more

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getting married costs a lot,getting devorced costs much more.
句中的married和devorced为什么用过去式?
what makes me unhappy is the fact that you didn't tell me the truth.句中makes为什么加S.和,didn't tell me the truth,既然did都用过去式,tell为什么不用过去式,
What i appreciated most unhappy was his friendliness.
句中appreciated为什么加ed,为什么用was而不用is?
I wonder if she has been invited.
has been 是什么时态,为什么不用be而用been呢?
1.wonder if she has been invited.
has been 是什么时态,为什么不用be而用been呢?
答:虚拟语气
2.didn't tell me the truth,既然did都用过去式,tell为什么不用过去式?
答:这是最基本语法呀!一个句中出现两个动词只需将助动词按时态写,就像这句:他不喜欢我,he dosen't like me .而不是he dosen't likes me .一样.
3.getting married costs a lot,getting devorced里面的married 和devorced 所指的并不是动词.加上d其实是动词名用的一种方法.
4.What i appreciated 和was his friendliness很明显在表达一种过去的事情.所有前后一致都用过去式