I can't find much about it but I found an example to illustrate it:

> 温めますか
>
> Do you want it heated?
> [weblio](https://ejje.weblio.jp/sentence/content/%22%E3%81%BE%E3%81%99%E3%81%8B%22/2)

I don't understand how the dictionary form can have the meaning 'to want' and
what is the difference with てもらいたいですか, てほしいですか, etc.
CC BY-SA 4.0
2018-12-25T23:29:34.603
64572
2018-12-26T07:02:26.657
2018-12-25T23:45:17.410
32056
32056
question
grammar
Dictionary form to ask if someone wants something
Based on what I know,

Instead of saying "want" (ーたい), it's more polite to say "shall I" (ーましょうか).

If you want to ask someone if they want something heated, it would be polite
to say this:

温めましょうか?
CC BY-SA 4.0
2018-12-26T07:02:26.657
64576
2018-12-26T07:02:26.657
32357
64572
answer