When they were served the ice cream 这是个什么时态的句子,是一般过去时吗可一般过去时不是直接served就行了,为什么还要加上 were

When they were oh when they were young after they were born 和 when they were born We were happy when they left. when l walk with two others, they must serve me as my teachers啥意思? They were all wet when they arrived at school.:Were they?Did they? They were singing whenwe were dancing可以用when They were surprised when they hear the news 同义句如题 They __an earthquake when they were traveling in Sichuan province 用when合并句子!They came home.They were wet. They were surprised when they heard the whisper.They were surprised ----- ----- the whisper. 帮忙翻译下：When I walk along with two others, they may serve me as my teachers. They were students when they were in their( )为什么是twenties? They were like olf friends and they were pleased when the plane landed safly 改错 some people hurt themselves when they were watching a sports programme.who were they? They were talking ( ) a film when come ( ) the room Who invented the aeroport?when were they born? they,what,doing,teacher,the,in,came,were,when