As If

She sounds as if she doesn't speak English correctly.
I feel as if we need to practice the grammar that we have learned each day.
It looks as if our teacher thinks everyone in this class understands the reading on the computer. It looks as if the teacher doesn't know the students' level.
It smells as though somebody grilled B. B. Q around here.
I didn't know her, but she treated me as if I were her good friend.
I don't like advertisments. The companies always advertise as if their products do a very good job.
We don't need to practice all the grammar that we have learned. We just need to practice some of the grammar we don't know well.