The -ing form appears in all continuous tenses (I am reading, they were sleeping) and as the gerund, a verb used like a noun (Swimming is fun; I like reading). Spelling: a silent -e drops (make → making), a stressed short vowel doubles the final consonant (run → running, stop → stopping), and -ie turns into -y (die → dying).
When to use it
Actions happening now He is reading a book right now. — He is reading a book right now.
Actions in progress in the past They were sleeping when I called. — They were sleeping when I called.
Gerund (verb as a noun) Swimming keeps you healthy. — Swimming keeps you healthy.
Endings · Conjugation
+ -ing
-ing
working
-e → -ing
-ing
making
doubling
-ning
running
-ie → -y
-ying
dying
Irregular verbs
run
running
sit
sitting
die
dying
Don't just read this, drill it
Verboteca drills every verb form with spaced repetition until it becomes automatic.