1、fit in ：装配好；给…安排时间；把…放进去；适应,适合(with)
2、fit in with ：同…一致；同…合得来；适合,符合,适应
显然区别大,总之前者加上with就同义了
3、fit in 是主动的 fit in with 是被动的，使适合
1. I don't think this is the box that this toy came in,it won't fit in. 我认为这不是装这个玩具的盒子，玩 具装不进去。
2.There was so much furniture in the salesroom that it became impossible to fit any more in. 营业部里装的家具十分拥挤，不可能 再放进任何家具了。
3. I'm very busy,I'll try to fit in a game of tennis at the weekend. 我虽然很忙，但要设法在周末安排打 一场网球。
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