to challenge
Regular verb: challenge - challenged- challenged

Indicative 	
Present 	Present continuous 	Preterite 	Preterite continuous 	
I challenge
you challenge
he challenges
we challenge
you challenge
they challenge 	Iamchallenging
youarechallenging
heischallenging
wearechallenging
youarechallenging
theyarechallenging	I challenged
you challenged
he challenged
we challenged
you challenged
they challenged	Iwaschallenging
youwerechallenging
hewaschallenging
wewerechallenging
youwerechallenging
theywerechallenging	
Present perfect 	Present perfect continuous 	Pluperfect 	Pluperfect continuous 	
I have challenged
you have challenged
he has challenged
we have challenged
you have challenged
they have challenged	I have been challenging
you have been challenging
hehasbeen challenging
we have been challenging
you have been challenging
they have been challenging	I had challenged
you had challenged
he had challenged
we had challenged
you had challenged
they had challenged	I had been challenging
you had been challenging
he had been challenging
we had been challenging
you had been challenging
they had been challenging	
Future 	Future continuous 	Future perfect 	Future perfect continuous 	
I will challenge
you will challenge
he will challenge
we will challenge
you will challenge
they will challenge 	I will be challenging
you will be challenging
he will be challenging
we will be challenging
you will be challenging
they will be challenging	I will have challenged
you will have challenged
he will have challenged
we will have challenged
you will have challenged
they will have challenged	I will have been challenging
you will have been challenging
he will have been challenging
we will have been challenging
you will have been challenging
they will have been challenging	

Conditional 	
Present 	Present continuous 	Past 	Past continuous 	
I would challenge
you would challenge
he would challenge
we would challenge
you would challenge
they would challenge 	I would be challenging
you would be challenging
he would be challenging
we would be challenging
you would be challenging
they would be challenging	I would have challenged
you would have challenged
he would have challenged
we would have challenged
you would have challenged
they would have challenged	I would have been challenging
you would have been challenging
he would have been challenging
we would have been challenging
you would have been challenging
they would have been challenging	

Infinitive 	
Imperative 	
Infinitive 	 	Imperative 	 	
to challenge 	 	challenge
Let's challenge
challenge 	 	

Participle 	
Present 	Past 	 	 	
challenging	challenged