1) County governments look after roads, libraries, museums, sports grounds, etc.
Do county governments look after roads, libraries, museums, sports grounds, etc?
What do county governments look after?
Do county governments look after roads, libraries, museums, sports grounds or dwellings?
County governments look after roads, libraries, museums, sports grounds, doesn't it?
Who looks after roads, libraries, museums, sports grounds?
2) The UK is a kingdom.
Is the UK a kingdom?
What kind of country is UK?
Is the UK a kingdom or federal republic?
The UK is a kingdom, isn't it?
What country is a kingdom?
3) Our friends swam in the river last year.
Did your friends swim in the river last year?
Where did your friends swim in the river last year?
Did your friends swim in the river or in the sea?
Our friends swam in the river last year, didn't they?
Who swam in the river last year?
4) His sister has bough't a new car.
Has his sister bought a new car?
What has his sister bought?
Has his sister bought a new car or bike?
His sister has bought a new car, hasn't she?
Who has bought a new car?