How can the difference between "comfortable with doing sth" and "comfortbale doing sth" be best explained?

Question

Answer

I thought about it long and hard and I really dont think there is a major difference between the meaning of the two.

Answer

After 'with' the -ing form is called a gerund and describes an activity. In other words the verb has the character of a noun.' I'm not comfortable with speaking in public' 
.Without 'with' the -ing form can either be a) a gerund  as it's not necessary to use 'with' ' I'm not comfortable speaking in public'
or b) a present participle describing an incomplete action.' 'I am comfortable sitting here'

Non perdere l'opportunità di imparare una lingua comodamente da casa tua. Esplora la nostra selezione di insegnanti di lingue esperti e iscriviti subito alla tua prima lezione!