Discuss - discussion

Repeat - repeat

Pronounce - pronunciation

Explain - explanation

Revise - revision

Translate - translation

Improve - improvement

Express - expression

Select - selection

Know - knowledge

If I work during holidays it'll be a good idea.

Unless she pay the fine now she'll be taken to court.

If I went to London I would improve my English.

If I won enough money in a lottery I would go on a round-the-world trip.

If meeting finishes late I'll get a taxi.

If I get a pay rise next week I will buy a new TV.

If I didn't feel sick I would go to the party.

If he fail his exam he'll take it again.

If tomorrow is rain I'll not walk to work.

If he knew her email address he would send her an email.

I won't forgive her if she doesn't apologise to me.