Adding -ing is the based form of? ?

-ing is a suffix, since it comes after a word.

A suffix.

-ing goes at the end of the word to show an action. I am running.

first aid for seizures is aimed at keeping the person safe until the seizure stops on its own. stay calm, loosen anything around the person's neck, do not restrain them or put anything in their mouth, clear the area around them, and stay with them after the seizure stops.

hope this !