in和into都可作介詞,與“里面”有關(guān),但用法有別.
in是表示物體位置的靜態(tài)介詞,表示“在……里面”.
They are sitting in the room.他們正坐在房間里.
The boy is in Class 2,Grade 3.這個男孩在三年級二班.
into是表示動作方向的動態(tài)介詞,表示“到……里面去”,常與表示動作的動詞（如come,go,run,rush等）連用.
He ran into the room just now.剛才他跑進(jìn)了房間.
They all jumped into the sea and swam to the island.他們都跳進(jìn)了海里,向那個島游過去.
有些動詞（如put,fall,throw等）既可用in,也可用into,這時in同into一樣,也表示動態(tài).
Can you help me put these things in the basket?
你能幫我把這些東西放到籃子里嗎?
The boy fell in the water.這個男孩掉進(jìn)水里了.
in還可用作副詞,意為“在家、往里面”,而into不能.
Is Tom in?湯姆在家嗎?
May I come in?我可以進(jìn)來嗎?