when Dr Gibbs wasn't saving lives,he was planting trees.社么意思 when 不是不能加两个进行时么

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when Dr Gibbs wasn't saving lives,he was planting trees.社么意思 when 不是不能加两个进行时么

when引导时间状从时,可以主句和从句都用进行时态,表示主从句动作同时发生.
如:Father was reading a book when Mother was cooking .
妈妈做饭时,爸爸正在看书.
When Dr Gibbs wasn't saving lives,he was planting trees.
句意:当 Gibbs 大夫不在治病救人时,他就在植树

引导时间状从句
主句和从句都用进行时态,表示主从句动作同时发生