If you think as I do, vote as I do.

如果你考虑问题和我一样，就和我投一样的票。

《柯林斯英汉双解大词典》

If you do, do the best.

如果你要做，就做到最好。

youdao

If you do not slurp, then your host will think that you do not like your food and will take offense.

如果你不发出声音，主人会认为你不喜欢这样的食品而感到生气。

youdao

In a poker game you do not want to let your opponents know if your cards are good or bad.

VOA: special.2009.11.22

So if you wanna do something conditionally, you generally needs to ask the question, is the following true or false.

假如想在一定条件下做一件事情，你需要判断下这个条件，来看看条件是真还是假。

哈佛公开课 - 计算机科学课程节选

And I think too, a really good exercise if you wanted to do is, if you have a dictionary,

我也认为，如果你想练习，如果你有字典的话，比较好的练习

有这样的困难 - SpeakingMax英语口语达人

You can never lose hope because if you do then what do you have to go by?

NPR: Roundtable: College Students Debate Pew Poll on Race

"If you do what I do you are going to end up making people sometimes happy and sometimes unhappy, " he says.

FORBES: Smart Collecting

Schering sent out a survey and asked doctors, 'Do you think Chlor-Trimetron works and if you do, what do you think the dose ought to be?

FORBES: Pharmaceuticals