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简介:
1.一般现在时: do/does (普遍情况下都这样)
He talks to his friends.
他和他的朋友们说话。
2.现在进行时: am/is/are doing
He is talking to his friends.
他正在和他的朋友们说话。
3. 现在完成时: have/has done (具有影响,说过了就不用再说了)
He has talked to his friends.
他已经和他的朋友们说过话了。
4.现在完成进行时: have/has been doing (还在继续)
He has been talking to his friends.
他一直和他朋友们在说话。