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Unit 6 Grammar
现在完成进行时态.
表示从过去某一时间开始一直延续到现在的动作。这一动作可能刚刚开始，也可能仍在继续，并可能延续到将来。
构成方式:
have/has been +动词ing
助动词，无义。做句式变化时，针对它们来做。
for + 时间段
since + 时间点/从句
用 how long 提问
How long have/has … been v-ing…?
Mr. Zheng
be born: 1972
teach science: 1995~ now
How long has Mr. Zheng been teaching science?
He has been teaching science for 15 years.
He has been teaching science since 15 years ago.
He has been teaching science since 1995.
He has been teaching science since he was 24.
Zhang Xinhua
was born: 1993
learn English: 2006~ now
How long has Zhang Xinhua been learning English?
She has been learning English since 2006.
She has been learning English for 4 years.
She has been learning English since she was 14.
She has been learning English since 4 years ago.
Jackie Chan
was born: 1954
acting: 1961~ now(47 years)
He has been acting for 47 years.
How long has Jackie Chan been acting?
He has been acting since he was 8 years old.
He has been acting since 1961.
…for…
…since…
Start: 9:00 am
Now: 13:00 pm
( 4 hours )
How long have they been skating?
They have been skating for 4 hours.
since 9:00 am.
since 4 hours ago.
How long has he been … ?
He has been …
ten o’clock

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