.1.A woman answered the phone . She told me you was busy 
=> A woman who told me you was busy answered the phone
2.: The bus is always crowded. I take It to school every morning.
---->the bus, which ibtake to school everyday, is always crowded
3: They are singging a song. I don't  know the song.
----> they are singging a song which i don't know
4: A man spoke to me. He was very helpful.
----> a man who spoke to me was very helpful
5: A midwife is a woman. She assists other women in childbirth.
----> a midwife is a woman who assists other women in childbirth
6: They are the chidren. Their team won the match  
----> they are the children whose team won the match.
7: The house is for sale. It has the green shutters. 
----> the house which has the green shutters is for sale