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ket的語法：could you please open the door
1. 過去進行時 用來談論過去某一時間正在發(fā)生的事情。 I was playing football at 3:30 yesterday. 用來討論過去某一時間同時發(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. 過去進行時 談論過去某個時候正在發(fā)生的事情 I was playing football at 3:30 yesterday. 談論過去同時發(fā)生的兩件事 He was doing homework while his sister was watching TV. 過去進行時和一般過去時出現(xiàn)在同一個句子中：
