when parents have allowed their children

问题描述:

when parents have allowed their children
to make mistakes and see their money wasted,with no more money for other things,the children will learn a useful lesson这句话中是因为有when所以要用现在完成时?还可以用其他什么时态呢?

那要根据你想用它在什么情景中了
也可以用一般现在时和现在进行时啊