CHALLENGE - PRESENT SIMPLE
★ i challenge
★ you challenge
★ he/she/it challenges
★ we challenge
★ you challenge
★ they challenge
CHALLENGE - PRESENT CONTINUOUS
★ i am challenging
★ you are challenging
★ he/she/it is challenging
★ we are challenging
★you are challenging
★ they are challenging
CHALLENGE - PRESENT PERFECT
★ i have challenged
★ you have challenged
★ he/she/it has challenged
★ we have challenged
★ you have challenged
★ they have challenged
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 Continuous is a tense in the English language used to emphasize that one action is still continuing in the present moment. The difference between Present Perfect and Present Perfect Continuous is that Present Perfect is emphasizing the action of the sentence while Present Perfect Continuous is emphasizing the duration of that action.
CHALLENGE - PRESENT PERFECT CONTINUOUS
★ i have been challenging
★ you have been challenging
★ he/she/it has been challenging
★ we have been challenging
★ you have been challenging
★ they have been challenging
CHALLENGE - PAST SIMPLE
★ i challenged
★ you challenged
★ he/she/it challenged
★ we challenged
★ you challenged
★ they challenged
CHALLENGE - PAST CONTINUOUS
★ i was challenging
★ you were challenging
★ he/she/it was challenging
★ we were challenging
★ you were challenging
★ they were challenging
CHALLENGE - PAST PERFECT
★ i had challenged
★ you had challenged
★ he/she/it had challenged
★ we had challenged
★ you had challenged
★ they had challenged
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
CHALLENGE - PAST PERFECT CONTINUOUS
★ i had been challenging
★ you had been challenging
★ he/she/it had been challenging
★ we had been challenging
★ you had been challenging
★ they had been challenging
CHALLENGE - FUTURE SIMPLE
★ i will challenge
★ you will challenge
★ he/she/it will challenge
★ we will challenge
★ you will challenge
★ they will challenge
CHALLENGE - FUTURE CONTINUOUS
★ i will be challenging
★ you will be challenging
★ he/she/it will be challenging
★ we will be challenging
★ you will be challenging
★ they will be challenging
CHALLENGE - FUTURE PERFECT
★ i will have challenged
★ you will have challenged
★ he/she/it will have challenged
★ we will have challenged
★ you will have challenged
★ they will have challenged
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.
CHALLENGE - FUTURE PERFECT CONTINUOUS
★ i will have been challenging
★ you will have been challenging
★ he/she/it will have been challenging
★ we will have been challenging
★ you will have been challenging
★ they will have been challenging

Conjugation of verb challenge