I would like 与「I want」意思一样，都是表示「我想要」或者加上「to」之后，表示「我想做某件事情」。

加上「would」，成为意思更加委婉及有礼貌，有诚意的句式或句型。与「May I……？」句式一样可以向别人寻求幫助或有礼貌地提出询问。例如：「I would like to have some more salad.」这与「May I have some more salad？」意思一样，而比「More salad please.」更有礼貌。

I would like to do sth是固定句型后面要加to。

也可后面直接加名词：I would like sth