Rewrite the sentences replacing "if (not)" by "unless". Copy the words in the same order, copy commas and full stops. Then press "Check".
He won't help you if you don't ask him.
She wouldn't cry if the situation weren't so bad.
If he doesn't like the film, he won't produce it.
If they weren't thirsty they wouldn't drink that water.
I wouldn't sell it if I didn't need the money.
If she doesn't eat now, she will become seriously ill.
She will start to cry if she doesn't get what she wants.
The Earth temperature will rise if we don't stop polluting so much.
She won't win the competition if she doesn't practise.
I wouldn't be angry if he didn't come late.