When do we add -NE when asking a question?

Question

There are some times that you use

QUID EST

or

UBI EST

Which I assume are known as a question starting point.

But then there are verbs that you add a NE at the end to make the other person know you are asking.

AMBULABIMUSNE

Which I assume it means Shall we walk?

So when you want to combine QUID or UBI with this verb to say something like Where shall we walk do we say

UBI AMBULABIMUSNE

Or

UBI AMBULABIMUS

Answer 1

We add -ne

1. when asking a yes-or-no question, that is to say, when we ask if a certain assertion is true or false, e.g.

Videsne canem? – Do you see the dog?

This is when we are asking neutrally. If we want to signal we are expecting or hoping for a negative answer, we can use the word num:

Num canem tetigisti? – Did you really touch the dog? / Surely you did not touch the dog? etc.

Or, if we want to signal we are expecting a positive answer, we can use nonne (which is actually non + -ne):

Nonne canem vidisti? – Did you not see the dog?

Simple -ne is neutral.

2. when asking for an alternative between two choices, where the “or” is always an:

Uter nostrum popularis est, tune an ego? – Which one of us two is a man of the people, you or me?

You can also leave the -ne out in this case (tu an ego) or use the word utrum:

Utrum ea vestra an nostra culpa est? – Is it your fault or ours?

Plot twist: To ask emphatically, you can also say utrumne, and an can be emphasized by saying anne.

By the way, all I just told you does not just apply to direct questions, but also to indirect questions, e.g.

Honestumne factu sit an turpe, dubitant. - They are unsure whether it is an honourable or shameful thing to do.

We do not add -ne when we have a question word like quid or ubi.