go into
1.进入(某空间、建筑物等)：
Go into the garden and pick some pears,will you?
到园子里去采些梨,好吗?
2.进入,住进(通常为短时期内)：
She had to go into hospital for her lumbar operation.
她因腰椎手术得住院.
go to
1.通到,通向,延伸到：
Does this road go to the railway station?
这条路通向火车站吗?
2.去到：
She goes to church every Sunday.
她每个星期天都去做礼拜.
go in
1.进入,放得进去：
That space is too small,the piano won't go in.
那空间太小,钢琴放不进去.