As I was putting the bike together,I discovered a piece was

As I was putting the bike together,I discovered a piece was missing.
时态的运用.前半句用过去进行时我理解,但是后半句为什么不是 a piece missed呢?后半句应该用一般现在时呀.
如：As she was working on the computer,she lost her internet connection.

ii之泪 1年前已收到2个回答举报

ryu0007 幼苗

共回答了23个问题采纳率：87% 举报

As I was putting the bike together, I discovered a piece was missing.因为missing是以-ing结尾的形容词,在此用作表语.这里前后句都是过去时(过去进行时也属过去时的一种).

1年前

zhengw83 幼苗

共回答了10个问题举报

她的电脑不能上网了当她正在用电脑的时候。表示过去发生的事情要用过去时啊。

1年前

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你能帮帮他们吗

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