Can I use both ましょう and ですか?

Question

I want to ask someone a question as to whether they want to do something.

Would you like to play Minecraft on the computer?

Would this be written as

コンピューターでマインクラフトをあそびましょうか。

OR

コンピューターでマインクラフトをあそびましょうですか。

?

Is there any difference between these two or is the second one just grammatically incorrect?

Answer 1

No, you cannot use it like this.

です is used after い-adjectives or な-adjectives or nouns, making it polite. The non-polite form would be だ or nothing for な-adj and nouns, or nothing at all for い-adj.

The ましょう construct in question is one of the conjugations of Japanese verbs, namely the volitional form in its polite version. The non-polite volitional form would be simply *おう.

です can NEVER go with verbs.

Example:

Polite:　僕は学生です　Non-polite:　僕は学生 / 僕は学生だ
Polite:　風が強いです　Non-polite:　風が強い　
Polite: 歌を歌いましょう！学校に行きましょう！　Non-polite: 歌を歌おう！学校に行こう！

The following is wrong:

歌を歌いましょうです！　or 　歌を歌おうです！