when 后面加doing or 不定式 都行,不过用法不一样.
when后面加doing,相当于从句when sb.is doing sth.
when后面加to do,相当于问句when are u going to do?
你的例句应该用This message is showed when keying a wrong word.
意思为当你输入一个错误的单词时,这个信息就会显示.
when 后面加doing or 不定式 都行,不过用法不一样.
when后面加doing,相当于从句when sb.is doing sth.
when后面加to do,相当于问句when are u going to do?
你的例句应该用This message is showed when keying a wrong word.
意思为当你输入一个错误的单词时,这个信息就会显示.