问的好 够难的 介词还可以作为副词或连词. 作为副词时可以叫做“小品词”.试比较: 1.My sister is in the house.( in,介词) 2.Is there anybody in?(in,副词) 少数介词可以作为连词,如 after,before,since,until 等. 1.It will not be long before they come back. 2.Will everything be all right until I come back? 仔细体会一下就明白了 很好理解 自己再多想想还有没有其它相似用法呢 留作homework 哈