• If you leave ice in the sun, it melts.

• If you stand in the rain, you get wet.

Negative:

• If he is not my friend, I don't trust him my secrets.

• She doesn't get in trouble if she is more careful.

Interrogative:

• If you need to work, what time do you wake up?

• What do you like to do if you have free time?

• Using the past simple instead of the present simple in the “if” clause or main clause

• Using other types of conditionals (first, second floor, or third) when a general truth or fact is being expressed

• Forgetting the comma when the “if” clause precedes the main clause