--摘自 http://www.englishpage.com/minitutorials/let.html --
Let
FORM
- [let + person + verb]
USE
- This construction means "to allow someone to do something."（允许某人做某事）
Examples:
- John let me drive his new car.
- Will your parents let you go to the party?
- I don't know if my boss will let me take the day off.
Make
FORM
- [make + person + verb]
USE
- This construction means "to force someone to do something."（强迫某人做某事）
Examples:
- My teacher made me apologize for what I had said.
- Did somebody make you wear that ugly hat?
- She made her children do their homework.
Have
FORM
- [have + person + verb]
USE
- This construction means "to give someone the responsibility to do something."（有给人安排工作的意味）
Examples:
- Dr. Smith had his nurse take the patient's temperature.
- Please have your secretary fax me the information.
- I had the mechanic check the brakes.
Get
FORM
- [get + person + to + verb]
USE
- This construction usually means "to convince to do something" or "to trick someone into doing something."（通过一定的手段让某人做某事）
Examples:
- Susie got her son to take the medicine even though it tasted terrible.
- How can parents get their children to read more?
- The government TV commercials are trying to get people to stop smoking.
Get vs. Have（大多数情下可以互换，但有些情况下表示的意思不同）
Sometimes "get someone to do something" is interchangeable with "have someone do something," but these expressions do not mean exactly the same thing.
Examples:
- I got the mechanic to check my brakes. At first the mechanic didn't think it was necessary, but I convinced him to check the brakes.
- I had the mechanic check my brakes. I asked the mechanic to check the brakes.
