我不知道为什么他今天没来上课。
I don't know why he didn't come to class today.
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didn't英 /ˈdɪdnt/|美 /ˈdɪdnt/
解释
didn't 是助动词 do 的否定形式，由 do 和 not 缩写而成，用于构成一般过去时的否定句。
I don't know why he didn't come to class today.
didn't 是助动词 do 的否定形式，由 do 和 not 缩写而成，用于构成一般过去时的否定句。