Exercise 1: Using Present participle to combine each pair of sentences into one. 1.Who saw the boy? He swam in the pool two hours ago. …………………………………………………………………………………………….. 2.The man is a clown. He is trying to stand on a ball. …………………………………………………………………………………………….. 3.The envelope has no stamp on it. It lies on the table. …………………………………………………………………………………………….. 4.My grandmother is old and sick. She never goes out of the house. ………………………………………………………………………………………….. 5.The street is very wide. It leads to the school. …………………………………………………………………………………………….. 6.Mr. John is my friend. He teaches my son English. …………………………………………………………………………………………….. 7.The students are sitting for the exam. They are from Singapore. …………………………………………………………………………………………….. 8.The fence surrounds our house. It is made of wood. …………………………………………………………………………………………….. 9.The man works in this hospital. He can speak three foreign languages. …………………………………………………………………………………………….. 10.A bus goes to the airport. It runs every half an hour. ……………………………………………………………………………………………..