How to use 过来，回来，去来，and 回去?
I use these words often in conversation, but I often feel I am using them incorrectly. I have translated their individual meaning several times, but I still feel I am not using them properly. Could someone give me some examples using each of the words? Thank you!

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Nice question!
过来：从另一个地点向说话人（或叙述的对象）所在地来sth or sb come from another place to the place where the speaker (or someone you are talking to) stands . Eg: 1.公交车来了，赶快过来吧！2.我们的组会就要开始了，你赶紧过来吧！
回来：从别处到原来的地方来。come back to the place where you left from. Eg:1.他每天早晨出去，晚上才回来。2.我打算去苏州玩两天，下周一回来。
回去：从别处到原来的地方去。go back to the place where you left from. Eg:1.家乡的桂花开了，我想回去看看。2.实验室的程序快跑完了，我得赶紧回去查看结果。
去来is now not used in our daily conversations. It exists in ancient Chinese, eg,  唐 孟郊 《古意》诗：“荡子守边戍，佳人莫相从，去来年月多，苦愁改形容。” which means "to leave". 
Reference: http://xh.5156edu.com/

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你可以过来帮我一下吗? 
你哥哥回来了吗? 
因为这两天下雪我可能过几天才能回去. 
去来,不是一个正确的词语. 不过把它颠倒一下就是,来去. 例子, 我上个月去纽约参加展览来去花了10天.

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as a chinese，i feel defficult to say the diffrence between those words.beacuse is really similar,haha;
and welcome to add me to you friend my email petsgre@gmail.com

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i dont know how to express ,it's a little hard for me in english, hhhha

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过来:that means you ask a person come to you , ah ,like close to you.
回来:come back from other place , like back to your home or your country
回去:like you are in your friends home ,your wife ask you to go back home, then ,you say to your friends, "i must go now"
去来:we seldom use it.