16. We think that it’s important for us to learn English well.
We think it important to learn English well.
17. I don’t know why they are standing there.
I don’t know what they are standing there for.
18. I wish I were a bird. I wish to be a bird.
16. We think that it’s important for us to learn English well.
We think it important to learn English well.
17. I don’t know why they are standing there.
I don’t know what they are standing there for.
18. I wish I were a bird. I wish to be a bird.