Our flight was delayed. We decided to spend time at the duty-free shops.

• As our flight was delayed, we decided to spend time at the duty-free shops.
• We have been spending time at the duty-free shops since our flight was delayed.
• We decided to spend time at the duty-free shops in case our flight was delayed.
• Although our flight was delayed, we decided to spend time at the duty-free shops.

Coal is an irreplaceable natural resource. Oil is also an irreplaceable natural resource.

• Neither coal nor oil is an irreplaceable natural resource.
• Either coal or oil is an irreplaceable natural resource.
• Both coal and oil are irreplaceable natural resources.
• Both coal and oil is irreplaceable natural resources.

The new restaurant looks good. However, it seems to have few customers.

• In order to get more business, the new restaurant should improve its appearance.
• The new restaurant would have more customers if it looked better.
• If it had a few more customers, the new restaurant would look better.
• Despite its appearance, the new restaurant does not appear to attract much business.

You make much money. You spend much.

• To spend more and more, you will make more money.
• The more money you make, the more you spend.
• The more you spend, the more money you make.
• You make more and more money so you spend more.

I wanted to find out the time of the performances. I phoned the cinema.

• I found out the time of the performances in order that I could phone the cinema.
• I phoned the cinema so that I could find out the time of the performances.
• I phoned the cinema so I found out the time of the performances.
• I could find out the time of the performances to phone the cinema.

It wasn’t her who you saw in her office last Friday because she's been out of town for two weeks.

• You needn’t have seen her in her office last Friday; she's been out of town for two weeks.
• You shouldn’t have seen her in her office last Friday; she's been out of town for two weeks.
• You can’t have seen her in her office last Friday; she's been out of town for two weeks.
• You can’t see her in her office last Friday; she's been out of town for two weeks.

I don’t think Max broke your vase because he wasn’t here then.

• Max wouldn’t have broken your vase because he wasn’t here then.
• Max was likely to break your vase because he wasn’t here then.
• Max can’t have broken your vase because he wasn’t here then.
• Max wasn’t able to break your vase because he wasn’t here then.

The unemployment rate is high. The crime rate is usually also high.

• The higher the unemployment rate is, the higher the crime rate is.
• The unemployment rate is as high as the crime rate.
• The unemployment rate and the crime rate are both higher.
• The high rate of unemployment depends on the high rate of crime.

We cut down many forests. The Earth becomes hot.

• The more forests we cut down, the hotter the Earth becomes.
• The more we cut down forests, the hotter the Earth becomes,
• The more forests we cut down, the Earth becomes hotter.
• The more we cut down forests, the Earth becomes hotter.

John was not here yesterday. Perhaps he was ill.

• John needn't be here yesterday because he was ill.
• Because of his illness, John shouldn't have been here yesterday.
• John might have been ill yesterday, so he was not here.
• John must have been ill yesterday, so he was not here.