I will be with you again in half an hour.

　　过半个钟头我还会跟你们在一起的。

　　(with 的介词短语作表语。另注意in 将来时态in 以后)

　　Our sympathies were with the students persecuted by the gang of four during the cultural revolution.

　　我们是非常同情"文革"中被"四人帮"迫害的青年学生的。(with 的介词短语作表语)。

　　海、陆、空、车、偶、被by，单数人类known to man

　　例： by land (air， sea， water， bus)

　　陆路(航空，水陆，水路，乘公共汽车)