It's enough to make a cat laugh的意思

请问“it's enough to say that ...”是什么意思？ Henry's mother was to look after the watch for Henry until he was old enough to own it it's was very embarrassing to not have enough money to...为什么是not have不是have not? “it's not enough that we do our best;sometimes we have to de what's required”最好中文解释 ｛It's better to .....it's easy to understand 还是....it's easy to understand it IT'S UP TO YOU it's up to u !是什么意思？ It's up to you! It's time to do sth