Some obscure abbreviations

I have some abbreviations. The context is either grammer or Biblical only. I tried to look for clues or solutions but to no avail.
I will be very grateful to any answer.

ptc.
Vrss. rd.
inf. cstr. vb. I guess inf - is infinitive and vb. is verb. what is cstr.?

Thank you very much

Yes, they do seem to be very obscure. I've checked several dictionaries and only 'inf = informal' matches any of your examples. 'Verb' is usually denoted as 'v,' so I don't think 'vb' = 'verb.' Could you provide some examples of the abbreviations in context?