IMO, both work in general, but not in this context. I think the most challenging thing forces the use of gerund (as a noun).
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
ChariotThe most challenging thing about being in the peace corps is finding a way to fit into the community.
I wonder if it is ok to use an infinitive following "is". The most challenging thing about being in the peace corps is to find a way to fit into the community.
When are infinitives are used after be and when are present participles used? Thank yo