lf Tom doesn not help him ,he can not work out the problem.
He can not work out the problem 【without Tom's help.】
The man did not stop play cards with his friends all day long.
The man 【kept playing】 cards with his friends all day long.
The girls were not afraid of animals any more.
The girls 【were no more 】 afraid of animals.
不明白的再问哟,请及时采纳,多谢!