подкрепи́ть

Very rarely used word (top 20,000)

Verb aspects

Imperfective (ongoing or repeatedly):

support or reinforce

Perfective (completed or one-time):

support or reinforce

Они подкрепи́ли свой до́вод но́выми фа́ктами.They amplified their argument by new facts.

Note: Stress change.

Imperative
ты	подкрепи́
вы	подкрепи́те

Active present
Active past	подкрепи́вший	someone who was doing
Passive present
Passive past	подкреплённый	supported or reinforced
Gerund present
Gerund past	подкрепи́в подкрепивши подкрепя́	while doing (past)