Before cars were invented, it ............................................(not/be) easy to take your family for a weekend outing.
couldn't have been/ can't have been
15
In the 1940s, people ............................................(not/own) a television, because they could get news and entertainment from their radios.
didn't need to own
15
Before satellite navigation in cars, people ........................(depend) on a passenger for directions.
had to depend
15
Some people ........................................................(drive) with the steering wheel in one hand and a map in the other.
had to drive
15
I .................................................(buy) this microwave oven, I never use it.
shouldn't have bought
15
Before we all had digital cameras, it ................................(be) expensive to keep buying film for your camera.
must have been
15
The electric spaghetti fork is a useless invention. The inventor really ..............................................(bother)
shouldn't have bothered.
15
The inventor of 'cats eyes' in the road ............................................(be given) a medal. They have saved so many lives.
should have been given
15
When James Watt invented the steam engine, he ................................................(realised) that the railway locomotive would follow.
must have realised
15
Who knows what inventions people like Leonardo da Vinci .....................................(come) up with if they'd had modern technology.
could have come
15
For obligation in the past we use
They had to watch television.
They must have watched television.
They can't have watched television.
They should have watched television.
20
For necessity or no necessity in the past we use
They didn't need to watch television
They didn't need watch television
They didn't need watched television
They needn't to have watched television
20
To give advice in the past (affirmative) we use
They should to have watched television
They should have watched television
They should have watch television
They should to have watch television
20
To speculate about the past ( affirmative) we use
He mustn't have watched television
He must have watched television
He can't have watched television
He can't have to watch television
20
To say that something was impossible in the past (negative) we use