It's easy to get confused because the word is a verb, and verbs often end in -ing. However, "controlling" is the present participle of the verb "to control," and therefore does not require an extra "l."
It's easy to get confused because the word is a verb, and verbs often end in -ing. However, "controlling" is the present participle of the verb "to control," and therefore does not require an extra "l."