Reduced relative clauses	

Sometimes it is possible to reduce relative clauses by removing the relative pronoun and auxiliary verb, and, in a few cases, by removing the relative pronoun and substituting a present participle for the main verb.	

Present time

He's a man who likes his food.
A woman who works at the office told me something funny.
The woman who is sitting next to the door used to go out with Teddy.
What can you give the man who has everything?
This message is for children who are picked up by their parents after school.
Cars which are parked illegally will be towed away.
The man who cleans the windows is off this week.
Did you hear about that film which is showing at the ABC cinema?
That house which is being done up in Queen's Avenue is apparently worth twenty million.
Turn left, drive another kilometer and you'll see a bridge which is being built.
She has the bedroom which overlooks the garden.
Anyone who wants to come to the party should let me know by tomorrow.
She's the kind of person who wants everything her own way.
Could anyone who needs a copy of the notes let me know later?
He's a person who needs to be told everything very clearly.

Past time

A man who drank 27 pints of beer in one evening has announced he will try to drink 30.
I once knew a woman who had ten cats.
A car which was standing outside the building at the time of the explosion was destroyed.
A number of people who were walking in the area reported seeing the UFO.
We watched a man who was making noodles by hand.
We were given a room which overlooked the sea.
I know a man who has run a Marathon.
I spoke to a man who had clearly been eating garlic.
He bought a car which had been owned by Michael Jackson.
He bought a house which had formerly been owned by Bill Gates.

Notes

Generally speaking, when a defining relative clause is made with a present* or past participle*, it is possible to reduce it by removing the relative pronoun and the auxiliary.

In some other cases it is also possible to reduce relative clauses. For example by substituting a present participle for the present or past tense of certain verbs -often those that express the physical position of objects - such as 'overlook,' 'lead', 'open' etc.

Answers

Present time

He's a man who likes his food.
A woman who works at the office told me something funny.
The woman who is sitting next to the door used to go out with Teddy.
What can you give the man who has everything?
This message is for children who are picked up by their parents after school.
Cars which are parked illegally will be towed away.
The man who cleans the windows is off this week.
Did you hear about that film which is showing at the ABC cinema?
That house which is being done up in Queen's Avenue is apparently worth twenty million.
She has the bedroom which overlooks  overlooking the garden.
Anyone who wants wanting to come to the party should let me know by tomorrow.
She's the kind of person who wants everything her own way.
Could anyone who needs wanting a copy of the notes let me know later?
He's a person who needs to be told everything very clearly.

Past time

A man who drank 27 pints of beer in one evening has announced he will try to drink 30.
I once knew a woman who had ten cats.
A car which was standing outside the building at the time of the explosion was destroyed.
A number of people who were walking in the area reported seeing the UFO.
We watched a man who was making noodles by hand.
Turn left, drive another kilometer and you'll see a bridge which is being built.
We were given a room which overlooked overlooking the sea.
I know a man who has run a Marathon.
I spoke to a man who had clearly been eating garlic.
He bought a car which had been owned by Michael Jackson.*
He bought a house which had formerly been owned by Bill Gates.*

*The word 'formerly' is essential in the last example. It makes it clear that the house was owned by Bill Gates at some time before you bought it, not when you bought it.
'I bought a house owned by Bill Gates', is a reduction of 'I bought a house which was owned by Bill Gates', and suggests that he was the owner at the time you bought it.