consult for,refer to ,look up区别

一、consult很少和for连用,1. 作为不及物动词时经常和with连用,If she had had a plan, she would have consult with an expert.如果她以前有这样的计划,她当时也就会找专家商量,2. 作为及物动词时,conulst someone +句子,I have to consult my lawyer about the matter.关于这个问题我得咨询律师的意见.
二、refer to 一般指涉及,与什么相关.He never referred to his sisters in his letters. 他在信里从未提到过他的姊妹.在法律文件中常用,Refer to the abovementioned letter I have some views.
三、look up 一般是查找字典、文献或资料等等.