英语语法-10 【动词】过去完成时、现在完成时
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1、过去完成时（Past Perfect）。
描述一个行为在过去发生也在过去结束。【Had+过去分词 Participle】
Until Mary studied abroad, she had never left the US.
After I had gone to the movies, I met up with my friends for coffee.
2、现在完成时（Present Perfect）
描述一个行为在过去发生并且直到现在。【Have+过去分词 Participle】
I have lived in New York for 10 years.
She has been a fan of Broadway musicals since she was a child.
3、未来完成时（Future Perfect）
描述一个行为将在未来被完成。【Will have +过去分词 Participle】
I will have finished my thesis by August.
4、过去分词 Participle
主要用在完成时态中（过去，现在，未来）
I have found/ seen many people.
描述一个行为在过去发生也在过去结束。【Had+过去分词 Participle】
Until Mary studied abroad, she had never left the US.
After I had gone to the movies, I met up with my friends for coffee.
2、现在完成时（Present Perfect）
描述一个行为在过去发生并且直到现在。【Have+过去分词 Participle】
I have lived in New York for 10 years.
She has been a fan of Broadway musicals since she was a child.
3、未来完成时（Future Perfect）
描述一个行为将在未来被完成。【Will have +过去分词 Participle】
I will have finished my thesis by August.
4、过去分词 Participle
主要用在完成时态中（过去，现在，未来）
I have found/ seen many people.
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