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ket的語法：could you please open the door
1. 過去進(jìn)行時(shí) 用來談?wù)撨^去某一時(shí)間正在發(fā)生的事情。 I was playing football at 3:30 yesterday. 用來討論過去某一時(shí)間同時(shí)發(fā)生的兩件事 He was doing homework while his sister was watching TV. 過去的情況和過去的情況發(fā)生在同一句
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ket核心語法：could you please open the door
1. 過去進(jìn)行時(shí) 談?wù)撨^去某個(gè)時(shí)候正在發(fā)生的事情 I was playing football at 3:30 yesterday. 談?wù)撨^去同時(shí)發(fā)生的兩件事 He was doing homework while his sister was watching TV. 過去進(jìn)行時(shí)和一般過去時(shí)出現(xiàn)在同一個(gè)句子中：
