We like music
We can dance to the music
We like music that we can dance to
We like dogs
The dogs are lovely
We like dogs which are lovely
I know the boy who is playing the guita
I know the boy
The boy is playing the guita
I have an apple
An apple is red
I have an apple that/which is red
修饰先行词 an apple I like some friends
Some friends like sports
I like friends who/that like sports
修饰先行词 friends John is just the boy
I want to see the boy
John is just the boy (whom/that ) I want to see
He has a friend
The friend’s father is a doctor
He has a friend whose father is a doctor
Let’s make up some sentences
Mary is a girl
Mary has long hair
John is just the boy
I want to see the boy
John is just the boy I want to see
Mary is a girl who/that has long hair
(whom/tha