设立条件用英语怎么说

To establish a condition means to set a requirement or a prerequisite that must be fulfilled in order for something to happen or be the case.
Here are some examples of how to express the idea of establishing a condition in English:
If clause: This is a clause in a sentence that introduces a condition. It is often used with the word "if" and is followed by a verb in the present tense to indicate a possible condition. For example:
"If you finish your homework, you can watch TV." (如果你完成了你的作业，你可以看电视。)
Conditionals: These are sentences that express a condition and its result. There are different types of conditionals in English, including the zero conditional, the first conditional, the second conditional, and the third conditional. For example:
Zero conditional: "If it rains, the streets get wet." (如果下雨，街道就会湿润。)
First conditional: "If you don't hurry, you'll miss the train." (如果你不快点，你会错过火车。)
Second conditional: "If I won the lottery, I would quit my job." (如果我中了彩票，我就会辞掉我的工作。)
Third conditional: "If I had studied harder, I would have passed the exam." (如果我更努力学习，我就能通过考试。)
On condition that: This phrase is used to introduce a condition that must be met in order for something to happen. For example:
"I will lend you the money on condition that you pay it back next week." (我会借你钱，前提是你下周还回来。)
Provided that: This phrase is used to introduce a condition that must be met in order for something to happen or be the case. It is similar to "on condition that." For example:
"You can borrow my car provided that you return it by tomorrow." (你可以借我的车，前提是你明天还回来。)
I hope this helps! Let me know if you have any other questions.