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The weather is bad. I can't go out with you.

• If the weather is not bad, I can go with you.

• If the weather were not bad, I couldn't go out with you.

• If the weather had not been bad, I could have gone out with you.

• If the weather were not bad, I could go out with you.

Tourists throw litter in the river. The water is polluted.

• Tourists throw litter in the river so the water is polluted.

• If tourists don't throw litter in the river, the water will not be polluted.

If he is not lazy, he will pass the exam.

= Unless he ____________, he will pass the exam.

If you don't study hard, you will get bad marks.

= Unless you ______________.

If he didn't play games too much, he would not be punished.

= Unless he______________.

But for her money, I couldn't have bought a bike.

= If it_____________________.

But for her money, I couldn't have bought a bike.

= Unless it_____________________.

But for her money, I couldn't have bought a bike.

= Had_____________________.

But for her money, I couldn't have bought a bike.

= Without_____________________.

Try hard and you will succeed.

= If ____________________