1.That big car is very expensive.(改为同义句）

1.That big car is very expensive.(改为同义句）
That big car is _____ _____.
2.Did they have a good time at yesterday's party?（同义句）
Did they ______ ______ at yesterday's party?
3.I brush my teeth before going to bed.
I brush my teeth before______ ________ to bed.