不同地方有不同配用的吧
我就依照我见识过了写出来让你参考
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checkup/check-up = 检查(医院检查)
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check up dictionary 查找字典,翻看字典
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check on 通常是用在人.（调查,视察某人的意思）
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check on the new employee.调查,视察新员工
check on his wife 调查他太太
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check out 看看（某样新事物）
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check out my website 来看看我的网页
check out this new product 看看这新产品
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check
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check dictionary 查字典
check your phone 查看你的手机
check my message 查看我的讯息
check to see whether u missed out on anything.检查看你是否漏掉了什么东西.
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check in 登记
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check in the hotel 登记/登入酒店“房间”
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check out
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check out of the hotel 登出酒店“房间”