Change the clause in each of the following sentences into a present participle phrase.
1 Because I do not konw her address,I can'twrite to her.
2 Remember to close the windows when you leave the classroom.
3 The woman who teaches us English is from America.
4 Since he was chewing some food,he couldn't say a word in reply.
5 When he entered the room,he saw a stranger searching his desk drawer for something.
6 My brother had a bad fall from his mountain bike that he missed school for three days.