she has been playing basketball for 2hours (改为同义句)

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she has been playing basketball for 2hours (改为同义句)

she has been playing basketball for 2hours (改为同义句)
she has been playing basketball for 2hours (改为同义句)

she has been playing basketball for 2hours (改为同义句)
It has been two hours since she played basketball.

She spends 2 hours playing basketball.
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She has been playing basketball since 2 hours ago.
在完成时态中for+一段时间=since+一段时间+ago

It has been two hours since she played basketball. 并不是“她打篮球已经两个小时了”,而是一个否定的意思“她有两个小时没打篮球了”。since后的句子中动词必须是点动词才能表示肯定意义,如果是持续动词就表示否定意义。再如:It's three years since she lived here。意思是她已经有三年没在这里住了。如果说她在此住三年了...

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It has been two hours since she played basketball. 并不是“她打篮球已经两个小时了”,而是一个否定的意思“她有两个小时没打篮球了”。since后的句子中动词必须是点动词才能表示肯定意义,如果是持续动词就表示否定意义。再如:It's three years since she lived here。意思是她已经有三年没在这里住了。如果说她在此住三年了就说It's 。。。since she began to live here。began是点动词。这个用法是高中语法中的一个重点和难点。

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