ket核心語(yǔ)法：could you please open the door

1. 過(guò)去進(jìn)行時(shí) 談?wù)撨^(guò)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^(guò)去同時(shí)發(fā)生的兩件事 He was doing homework while his sister was watching TV. 過(guò)去進(jìn)行時(shí)和一般過(guò)去時(shí)出現(xiàn)在同一個(gè)句子中：