1)We think Tom is a clever boy改为否定句2）My watch is not the same as yours.改为同义句3）Exercising every day helps you to keep healthy改为同义句.

1)We think Tom is a clever boy改为否定句2）My watch is not the same as yours.改为同义句
3）Exercising every day helps you to keep healthy改为同义句.

1.We don't think Tom is a clever boy.
2.My watch is different from yours.
3.Exercising every day helps you to keep in good health.