when l left

when l left when l walked into my history class,l realized that l left my homewok when l walked into my history class,l realized that l left my homewok要英语短文 station the left got train when the had l to 帮我连成一个句子 when l got to the airport,the plane____.leftwas already lefthad already lefthad alresdy been left the children ( ) on the playground when l left school 为什么用were playing 对画线部分提问（Tom was playing ping-pong when l left.)Tom was playing ping-pong when l left.-------------------- ----- Tom ----- ping-pong?关键是时态啊,用while还是when? when you left .l lost a part me it is still so hard to believe baby .please come back . l left a suitcase是什么意思 Do you know when he left?这里为什么用left Something h____ when I left home. when i left school,it_______(rain)hard. We were happy when they left. when he left,his mother ( )(cook). 翻译when her left pole broke 被动语态的概念是什么?例：1.traffic accidents _______ at the street corner.A.often happen B.are often happened2.When l got to the airport,the plane ______.A.had already left B.had already been left为什么？ when l was 是什么意思 when l was twelve