Tolong dijawab dengan benar ya. Soalnya besok dikumpul!

2. while bill was phoning his friend, someone beat his shoulder from behind
3. while rino was talking to his mother, there was a strange noise in the phone
4. he was studying mathematic when he was listening music from radio
4. while jhon and betty were doing experiment in laboratory, the bell rang

moga membantu ya :)

2. While Bill was phoning his friend, someone beat his shoulder from behind. 
Bill was phoning his friend when someone beat his shoulder from behind.

3. While Rino was talking to his mother, there was a strange noise in the phone.
Rino was talking to his mother when there was a strange noise in the phone.

4. While he was studying Mathematic, he was listening music from the radio.
He was studying Mathematic when he was listening music from the radio.

5. While the bell rang, John and Betty were doing experiment in the laboratory.
John and Betty were doing experiment in the laboratory when the bell rang.