How to form it
Take the verb 'to be' (am, is, are) + the main verb + -ing.
I am eating. You are eating. He is eating. She is eating. We are eating. They are eating.
If the verb ends in -e, drop the e and add -ing: write → writing, make → making.
If it is one syllable ending in consonant-vowel-consonant, double the last letter: run → running, sit → sitting.