He is an American child改为复数形式
1.This is an interesting film（改为感叹句）
interesting film.
thisfilmis.
2.They go to shchool by bike.(对by bike提问)
they to school?
3.He was so busy that he couldn't go to the concert.（改为同义句）
He was busy go to the concert.
4.He is an American child（改为复数形式）
Thy are .