Welcome, Rafael.
The following are examples of Replacement. Movement isn't a factor: the subjects (Snow, Max) are replaced by WH-words (What, Who):
Statement:
Snow makes Max smile.
Question: What makes Max smile?
Statement: Max turned the stove on.
Question: Who turned the stove on.
The same doesn't hold true for objects, or rather, words that come after the verb.
Movement and
Do-Insertion are factors:
Statement: They eat
lunch.
Question: What do they eat?
Here's how it works. The object "lunch" is replaced my "what", then "what" is moved to the front of the sentence, and the auxiliary "do" is added to mark movement, or rather, to signal that a word from within the structure [...] has moved out of that structure, like this,
Statement: They eat lunch.
Stage #1: Replacement => [They eat
what]
Stage #2: Movement =>
what [they eat]
Stage #3: DO-Insertion: what
do [they eat]
Question: What do they eat?
Additionally,
With the 3rd person singular, the -s is taken off the verb and added to the auxiliary, giving DO => DOES:
Statement: Max lives
on the sofa.
Question: Where does Max live?
With the verb BE (is, are, was, etc) DO-Insertion is not applicable, but Subject-Verb inversion is:
Statement:
She is nice.
Question:
Is she nice?
Hope that helps.
