Soustraire belong to the 3
rd group. Soustraire is a common french verb.
Soustraire is conjugated the same way that verbs that end in :
-aire
Soustraire is conjugated with
auxiliary avoir.
Soustraire is a defective verb.
It can not be conjugated in all possible forms.
Soustraire verb is
direct transitive.
French verb soustraire can be conjugated in the reflexive form:
Se soustraire
Soustraire verb is a direct transitive verb, so passive voice can be used.