APPRECIATE - PRESENT SIMPLE
★ i appreciate
★ you appreciate
★ he/she/it appreciates
★ we appreciate
★ you appreciate
★ they appreciate
APPRECIATE - PRESENT CONTINUOUS
★ i am appreciating
★ you are appreciating
★ he/she/it is appreciating
★ we are appreciating
★you are appreciating
★ they are appreciating
APPRECIATE - PRESENT PERFECT
★ i have appreciated
★ you have appreciated
★ he/she/it has appreciated
★ we have appreciated
★ you have appreciated
★ they have appreciated
A transitive verb always has a noun that  receives the action of the verb, called the direct object.
An intransitive verb never has a direct or indirect object. Although an intransitive verb may be followed by an adverb or adverbial phrase, there is no object to receive its action
APPRECIATE - PRESENT PERFECT CONTINUOUS
★ i have been appreciating
★ you have been appreciating
★ he/she/it has been appreciating
★ we have been appreciating
★ you have been appreciating
★ they have been appreciating
APPRECIATE - PAST SIMPLE
★ i appreciated
★ you appreciated
★ he/she/it appreciated
★ we appreciated
★ you appreciated
★ they appreciated
APPRECIATE - PAST CONTINUOUS
★ i was appreciating
★ you were appreciating
★ he/she/it was appreciating
★ we were appreciating
★ you were appreciating
★ they were appreciating
APPRECIATE - PAST PERFECT
★ i had appreciated
★ you had appreciated
★ he/she/it had appreciated
★ we had appreciated
★ you had appreciated
★ they had appreciated
The PAST SIMPLE tense, is also called the PRETERIT.
APPRECIATE - PAST PERFECT CONTINUOUS
★ i had been appreciating
★ you had been appreciating
★ he/she/it had been appreciating
★ we had been appreciating
★ you had been appreciating
★ they had been appreciating
APPRECIATE - FUTURE SIMPLE
★ i will appreciate
★ you will appreciate
★ he/she/it will appreciate
★ we will appreciate
★ you will appreciate
★ they will appreciate
APPRECIATE - FUTURE CONTINUOUS
★ i wil be appreciating
★ you will be appreciating
★ he/she/it will be appreciating
★ we will be appreciating
★ you will be appreciating
★ they will be appreciating
APPRECIATE - FUTURE PERFECT
★ i will have appreciated
★ you will have appreciated
★ he/she/it will have appreciated
★ we will have appreciated
★ you will have appreciated
★ they will have appreciated
APPRECIATE - FUTURE PERFECT CONTINUOUS
★ i will have been appreciating
★ you will have been appreciating
★ he/she/it will have been appreciating
★ we will have been appreciating
★ you will have been appreciating
★ they will have been appreciating

Conjugation of verb Appreciate