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How long is it since Oliver bought that driverless car?

• When did Oliver started to buy that driverless car?

• How long has Oliver bought that driveless car?

• When did Oliver buy that driverless car?

• How long did Oliver buy that driverless car?

People now live longer than they did a few decades ago

• People now do not live as long as they did a few decades ago

• Life expectancy has increased over the past few decades

• In the past people lived longer than they do now

• Life expectancy has decreased over the past decades

The construction workers started pulling down the old supermarket to build a shoping mall 2 days ago

• The construction workers have pulled down the old supermarket to build a shopping mall for 2 days

• The construction workers have started pulled down the old supermarket to build a shopping mall for 2 days

• The construction workers haven't pulled down the old supermarket to build a shopping mall for 2 days

• The construction workers haven't pulled down the old supermarket to build a shopping mall 2 days ago

People should take regular exercise to keep fit

• People are advised to take regular exercise to keep fit

• People are asked to take regular exercise to keep fit

• People don't have to take regular exercise to keep fit

• People should have taken regular exercise to keep fit

It's compulsory for Mai to come home before curfew

• Mai mustn't be at home after curfew

• Mai has to be at home before curfew

• Mai needn't be at home after curfew

• Mai might be at home before curfew

Young people have to respect old people

• Young people should have respected old people

• Old people have to be respected

• Old people should have been respected

• Young people are allowed to respect old people

I am not allowed to disobey my parents' orders

• I must disobey my parents' orders

• I mustn't disobey my parents' orders

• My parents' orders must be obeyed

• My parents' orders must be disobeyed

Our living conditions started to improve a few years ago

• Our living conditions have not improved

• Our living conditions improved a few years ago

• Our living conditions have just started to improve

• Our living conditions have improved for a few years

She last dyed her hair when she was 20

• She has dyed her hair since she was 20

• The last time she dyed her hair was at the age of 20

• She didn't dye her hair since she was 20

• It's at the age of 20 that she has dyed her hair

It's a good idea to deal with conflicts in a calm state

• We can find solutions to conflicts in a hot-tempered state

• We had better not deal with conflicts in a calm state

• Conflicts ought not to be dealt with in a calm state

• Conflicts should be dealt with in a calm state