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

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Whentheywereservedtheicecream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wereWhentheywereservedthei

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 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 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 served the ice cream 意思是何时有人给他们提供了冰激 When they served the ice cream 意思是他们何时给别人提供冰激凌
前者是被动,被提供,也即有人提供
后者是主动,他们是提供者