VERBS, MOODS OF:-- Infinitive active where we use passiveInfinitive active is often found where we use the passive, as in
This is especially common in "what's to do" (T. N. iii. 3. 18; &c.) for "what's to be done." See Ellipses, 405, and compare
“Yet, if men moved him, was he such a storm
As oft 'twixt May and April is to see.
i.e. "not to be trusted."
“Savage, extreme, rude, cruel, not to trust.