Conditionals 0, I, II, III
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If I (to have) time last night, I (to finish) watching the programme.

If I (to have) a lot of money, I (to go) travelling.

If I (to be) you, I (to discuss) it with your girlfriend.

If you (to heat) ice, it (to melt).

If you (to be) busy, I (to leave) you alone.