Learn Hardcore Latin: Puer exiturus matrem rogat utrum cum ea venire possit. - The boy, about to go out, asks his mother whether he can come with her.

Breakdown of Puer exiturus matrem rogat utrum cum ea venire possit.

What exactly is exiturus?

Exiturus is the future active participle of exire (to go out, leave).

Here it means something like about to leave or intending to leave. So puer exiturus means the boy, about to leave.

It is formed from the supine stem of exire:

So this participle shows an action that is still in the future relative to the main verb rogat.

Why is exiturus in the form -us?

Because it agrees with puer.

Puer is:

So the participle modifying it must also be:

That is why we get exiturus, not exitura or exiturum.

Why is matrem in the accusative?

Because matrem is the direct object of rogat.

The verb rogare means to ask, and the person being asked is often put in the accusative: