Who, Which, That, Whom, Whose, When, Where
Who – we use for people
That’s the man who I saw outside your flat last week. ( – I saw him and I told you about him)
She was the one who looked strange to me. ( – I thought she looked strange.)
They are the couple who is getting married next month. ( – I told you that these people are getting married.)
Which – we use for animals and things
That was a lovely dog which I saw you with yesterday. ( – I saw you with a lovely dog.)
He had a car accident in the car which he bought last year. ( – He bought a car last year and has had an accident recently.)
The cake which you brought with you was very nice. ( – You brought a very nice cake.)
That – both people and things
He’s the man that won the race. ( – I told you about him winning the race.)
I lost the mobile phone that I got for Christmas. ( – I got a phone and I lost it.)
She married a man that she met at university. ( – She met him at university.)
Whom – same as ‚who‘ but formal
You should call the man to whom I told about your special skills. ( – I told him about your skills and you should call him.)
Meet Jack, my boss, whom I told you about earlier. ( – I told you about him earlier.)
Whose – use as his, her, its, their
Come and meet John whose sister is my colleague. ( – John’s sister is my colleague.)
I apologised to Mary whose car I crashed. ( – Mary’s got a car, I crashed it and I apologised.)
He fell in love with Jane whose father is a doctor. (- father of Jane is a doctor.)
When – we use it for time
It happened when I drove to work this morning.
We met when on holiday in Spain.
I played tennis a lot when I was at secondary school.
Where – we use it for place
This is the house where I spent most of my childhood.
Don’t tell him where you live.
We like going to the bar where we met for the first time.
Why – after reason
That’s the reason why I have never got married.
He’s the reason why we moved out of Bristol.
When an object in a main clause is the subject in the subordinate clause we can not omit who, which, that.
Whose and where are normally not omitted from a sentence.