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初二下Unit 3What were you doing when the UFO arrived?Listen!Some bird (were singing) in the tree.为什么填were singing,而不是are singing?
题目内容：
初二下Unit 3What were you doing when the UFO arrived?
Listen!Some bird (were singing) in the tree.
为什么填were singing,而不是are singing?优质解答
这个时态是过去进行时态.因为当你看到一些鸟唱歌的时候.一些鸟唱歌是在你看到之前就开始的,只是持续到现在的.希望对你有所帮助.我英语系的,以后你不清楚可以问我.
初二下Unit 3What were you doing when the UFO arrived?
Listen!Some bird (were singing) in the tree.
为什么填were singing,而不是are singing?
Listen!Some bird (were singing) in the tree.
为什么填were singing,而不是are singing?
优质解答
这个时态是过去进行时态.因为当你看到一些鸟唱歌的时候.一些鸟唱歌是在你看到之前就开始的,只是持续到现在的.希望对你有所帮助.我英语系的,以后你不清楚可以问我.
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