S+Lv+Prep+Phrase(介词短语作表语)1.昨晚你在家吗2.那个女孩还在办公室3.他病了求讲解

1. were you at  home last night？

2. is that girl still at the office？

3. he is ill。

   表语就是在系动词be之后的成分啊，前两句一个是were，一个是is，最后一句不知都怎么用介词词组作表语啊

1 Were you at home last night
2 That girl is still at the office .
3 He is ill .
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