Expier belong to the 1
st group.
Expier is conjugated the same way that verbs that end in :
-ier
Expier is conjugated with the two auxiliaries
être and
avoir.
Expier verb is
direct transitive.
French verb expier can be conjugated in the reflexive form:
S'expier
Expier verb is a direct transitive verb, so passive voice can be used.
Attention: passive voice can only be used when expier verb is conjugated with auxiliary avoir.