Adverb Clause dapat diubah menjadi Modifying Phrase jika subjek dari adverb Clause dan subjek dari main Clause sama.
1. DAPAT DIRUBAH
* While I was sitting in class, I fell asleep MENJADI While sitting in class, I fell asleep.
* While Ann was sitting in class, she fell asleep MENJADI While sitting in class, Ann fell asleep.
* Since Mary came to this country, she has made many friends MENJADI Since coming to this country, Mary has made many friends.
2. TIDAK DAPAT DIRUBAH
* While the teacher was lecturing to the class, I fell asleep.
* While we were walking home, a frog hopped across the road in front of us.