Because the sentence pattern allows you to very softly express a dislike about a suggested action.

因为这个句型能让你以一种温和的方式表达对某一提议的不喜。

This sentence pattern is great when you want to express regret for something that you perhaps did not do.

当你想表达对一些过去没做成的事情感到后悔时，你可以使用这个句型。

The sentence pattern will allow you to communicate how you would like something to change and how you're feeling at the moment.

这个句型将使你可以表达你想某事如何改变，以及你现在的感受。

That is the limit of sentence pattern.

这些就是句型的限度。

And they are all the same sentence pattern.

而且它们都是同一种句型的。