Why do (something)?

Means "for what reasons should we do it, what motivations would be ours, what would push us to do it?". So a reflection prior to the realization on the interest to act.

To do what ? Equivalent to "to do what?". The question that arises is therefore the finality or the desired goal. So a reflection prior to the realization on what we are trying to achieve.

The difference between why and for what:

Why :

-In one word, why is an interrogative conjunction and calls because in response: "Why are you coming here? Because I have to talk to you."

- Means "for what reasons should we do it, what motivations would be ours, what would push us to do it?".

So a reflection prior to the realization on the interest to act.

Why:

In two words, means; for what thing:

"What did you come here for? To work."

To do what ? Equivalent to "to do what?".

The question that arises is therefore the finality or the desired goal.

So a reflection prior to the realization on what we are trying to achieve.

It is the same for because and by what.

- written in two words, it is a signifying conjunctive locution; due to:

"I did it because I liked it."

By what, written in three words, means: by the thing that: "By what I know of him, I have reason to be wary."

Difference between why and for what.- written in one word, why is an interrogative conjunction and calls because in response: "Why are you coming here? Because I have to talk to you." For what, in 2 words, means; for what, "What did you come here for? To work."

It is the same for because and by what.- written in 2 words, it is a signifying conjunctive locution; because of: "I did it because I liked it." By what, written in 3 words, means: by the thing that: "By what I know of him, I have reason to be wary."