there are't enough bues.和there isn't enough parking.为什么前面用are后面用is?

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• there are't enough bues.和there isn't enough parking.为什么前面用are后面用is?
• （1）we mustn't buy things we （don't need）和No,I （needn't ）这两个可以互换吗?为什么.（2）she didn't have to find them .They found her 这里的didn't have to 和needn't have 互换吧.那这句话的言外之意是什么.是她已经去找过了但其实不必要的?（3）（不必要可以用needn't和don't have to 表示.它的完成时和过去式分别是needn't fave,didn't have to和didn'tneed to） 这句话就是说前面的那个完成时表示的是已经做了,但没有必要.那后面的过去式又表示什么意思呢
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