CHANGE - PRESENT SIMPLE
★ i change
★ you change
★ he/she/it changes
★ we change
★ you change
★ they change
CHANGE - PRESENT CONTINUOUS
★ i am changing
★ you are changing
★ he/she/it is changing
★ we are changing
★you are changing
★ they are changing
CHANGE - PRESENT PERFECT
★ i have changed
★ you have changed
★ he/she/it has changed
★ we have changed
★ you have changed
★ they have changed
The Simple Past Tense, also called Simple Past or Preterite is a verb tense that is used to describe completed action happend in the past. It is the most basic form of past tense and it is formed by adding d, ed or ied to the base structure of the verb.
Present Perfect is a tense used to express the activity that started in the past and is still going on in the present tense. In British English this is the most used tense of them all. When you want to tell about your experience up to the present, you use Present Perfect. The prepositions that are often used with this tense are NEVER, EVER, JUST, ALREADY, YET and many others.
CHANGE - PRESENT PERFECT CONTINUOUS
★ i have been changing
★ you have been changing
★ he/she/it has been changing
★ we have been changing
★ you have been changing
★ they have been changing
CHANGE - PAST SIMPLE
★ i changed
★ you changed
★ he/she/it changed
★ we changed
★ you changed
★ they changed
CHANGE - PAST CONTINUOUS
★ i was changing
★ you were changing
★ he/she/it was changing
★ we were changing
★ you were changing
★ they were changing
CHANGE - PAST PERFECT
★ i had changed
★ you had changed
★ he/she/it had changed
★ we had changed
★ you had changed
★ they had changed
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
CHANGE - PAST PERFECT CONTINUOUS
★ i had been changing
★ you had been changing
★ he/she/it had been changing
★ we had been changing
★ you had been changing
★ they had been changing
CHANGE - FUTURE SIMPLE
★ i will change
★ you will change
★ he/she/it will change
★ we will change
★ you will change
★ they will change
CHANGE - FUTURE CONTINUOUS
★ i will be changing
★ you will be changing
★ he/she/it will be changing
★ we will be changing
★ you will be changing
★ they will be changing
CHANGE - FUTURE PERFECT
★ i will have changed
★ you will have changed
★ he/she/it will have changed
★ we will have changed
★ you will have changed
★ they will have changed
Present Perfect is a tense used to express the activity that started in the past and is still going on in the present tense. In British English this is the most used tense of them all. When you want to tell about your experience up to the present, you use Present Perfect. The prepositions that are often used with this tense are NEVER, EVER, JUST, ALREADY, YET and many others.
CHANGE - FUTURE PERFECT CONTINUOUS
★ i will have been changing
★ you will have been changing
★ he/she/it will have been changing
★ we will have been changing
★ you will have been changing
★ they will have been changing

Conjugation of verb change