Well,In order to make a sentence with "would rather" you have two options. 1.I would rather go 2.I would rather I went.(if "would rather" percedes a pronoun,the verb after the pronoun should be in subjunctive form which means "went" in this case instead of "go". 2."Would prefer" is followed by infinitive. I would prefer( I'd prefer) to have tea in the morning. however,there are better ways to express the same thing instead of using= "would prefer" such as I prefer to, I want to,I like to.