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 	I'mchallenging
you'rechallenging
he'schallenging
we'rechallenging
you'rechallenging
they'rechallenging	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've challenged
you've challenged
he's challenged
we've challenged
you've challenged
they've challenged	I'vebeen challenging
you'vebeen challenging
he'sbeen challenging
we'vebeen challenging
you'vebeen challenging
they'vebeen challenging	I'd challenged
you'd challenged
he'd challenged
we'd challenged
you'd challenged
they'd challenged	I'd been challenging
you'd been challenging
he'd been challenging
we'd been challenging
you'd been challenging
they'd been challenging	
Future 	Future continuous 	Future perfect 	Future perfect continuous 	
I'll challenge
you'll challenge
he'll challenge
we'll challenge
you'll challenge
they'll challenge 	I'll be challenging
you'll be challenging
he'll be challenging
we'll be challenging
you'll be challenging
they'll be challenging	I'll have challenged
you'll have challenged
he'll have challenged
we'll have challenged
you'll have challenged
they'll have challenged	I'll have been challenging
you'll have been challenging
he'll have been challenging
we'll have been challenging
you'll have been challenging
they'll have been challenging	

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

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

Participle 	
Present 	Past 	 	 	
challenging	challenged