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举例说明吧...yet:还...I haven't read it yet;while:1,当...时,2.表示对比的...he is playing ,while I am reading.however和but的区别：But 在文法上是一个连接词,即用来连接两句完整句子的字；但 however 只是个a...
举例说明吧...yet:还...I haven't read it yet;while:1,当...时,2.表示对比的...he is playing ,while I am reading.however和but的区别：But 在文法上是一个连接词,即用来连接两句完整句子的字；但 however 只是个a...