Can and Can't Do, Asking Someone to Do Something

Ikemasen = Used for something you can't do because you aren't allowed.

mo ii desu = Can/Allowed

~~ Use these with the ~te form of the verb it seems?

(koto ga) Dekimasen = Used for something you just can't do.

(koto ga) Dekimasu = Can (ability to)

??

ASKING SOMEONE TO DO SOMETHING:

~~ Use the ~te form when asking someone to do something (Utatte kudasai) ?

You don't have to say a "give" verb when asking for something.

Kare ni pen o kudasai = Give him a pen please (no give verb though!)