nếu Englisch:

If two men always have the same opinion, one of them is unnecessary.

If you don't want to put on sunscreen, that's your problem. Just don't come complaining to me when you get a sunburn.

What if you gave a speech and nobody came?

If you're tired, why don't you go to sleep? "Because if I go to sleep now I will wake up too early."

Come if possible.

It's still too hard to find a job. And even if you have a job, chances are you're having a tougher time paying the rising costs of everything from groceries to gas.

I've heard it said that it's harder to please a woman than to please a man. I wonder if that's true.

The iPad would be a perfect solution for me if it could properly display web pages with Flash content.

If you want to sound like a native speaker, it's easier if you choose one dialect and stick with it. Native speakers don't usually mix dialects in everyday speaking.

If you can't visit a country where they speak the language you are learning, find a local bar where native speakers of that language hang out and start hanging out there.

Please advise us, if possible, of a company which has developed image processing software.

Tom wondered if Mary would think that eight in the morning was too early for him to open a bottle of wine.

Wouldn't it be great if a gender-neutral pronoun for "he" or "she" existed in English?

If you raise an eyebrow, it can mean "I want to have sex with you", but also "I find that what you just said is completely idiotic."

If my wife calls, just tell her I'm in an important meeting and cannot be disturbed.