I am doing a linguistic comparison of Indo European copular. Can anyone here provide a conjugation table of the Avestan verbs corresponding to the proto Indo European form *h1es- (Sanskrit asti) and *bʰuH- (Sanskrit bhavati). Thanks.
You need to realise that only a few forms of these roots are actually attested in Avestan, so it is not really possible to construct a complete conjugation table. Most of the attested forms can be found here (in the section on "verbal inflection"):