春风 古琴:How long have you been collecting shells?与How long have you collected shells?的区别
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一个是过去完成进行时.一个是现在完成时
前一句表示动作没结束,一直持续到现在,
前者是强调“一直地”
第一个是过去完成进行时,第二个是现在完成时
present perfect continuous emphasises the results,otherwise present perfect emphasises the progress
how long have you been 用法
How long have you been ____Greener China ? A.with B.at C.from D.through
How long have you been collecting shells?与How long have you collected shells?的区别
How long have you been collecting shells?与How long have you collected shells?的区别
How long have you _______(have) this book?
How long have you __?Since 1990.A.bought MP3 B.joined the Party C.lived in the town
HOW long have you been studying english 怎么回答
how long have you been in love with your boss?
how long have you been in love with your boss?
how long have you been keeping this to yourself?