to concern
Regular verb: concern - concerned- concerned

Indicative 	
Present 	Present continuous 	Preterite 	Preterite continuous 	
I concern
you concern
he concerns
we concern
you concern
they concern 	I'mconcerning
you'reconcerning
he'sconcerning
we'reconcerning
you'reconcerning
they'reconcerning	I concerned
you concerned
he concerned
we concerned
you concerned
they concerned	Iwasconcerning
youwereconcerning
hewasconcerning
wewereconcerning
youwereconcerning
theywereconcerning	
Present perfect 	Present perfect continuous 	Pluperfect 	Pluperfect continuous 	
I've concerned
you've concerned
he's concerned
we've concerned
you've concerned
they've concerned	I'vebeen concerning
you'vebeen concerning
he'sbeen concerning
we'vebeen concerning
you'vebeen concerning
they'vebeen concerning	I'd concerned
you'd concerned
he'd concerned
we'd concerned
you'd concerned
they'd concerned	I'd been concerning
you'd been concerning
he'd been concerning
we'd been concerning
you'd been concerning
they'd been concerning	
Future 	Future continuous 	Future perfect 	Future perfect continuous 	
I'll concern
you'll concern
he'll concern
we'll concern
you'll concern
they'll concern 	I'll be concerning
you'll be concerning
he'll be concerning
we'll be concerning
you'll be concerning
they'll be concerning	I'll have concerned
you'll have concerned
he'll have concerned
we'll have concerned
you'll have concerned
they'll have concerned	I'll have been concerning
you'll have been concerning
he'll have been concerning
we'll have been concerning
you'll have been concerning
they'll have been concerning	

Conditional 	
Present 	Present continuous 	Past 	Past continuous 	
I'd concern
you'd concern
he'd concern
we'd concern
you'd concern
they'd concern 	I'd be concerning
you'd be concerning
he'd be concerning
we'd be concerning
you'd be concerning
they'd be concerning	I'd have concerned
you'd have concerned
he'd have concerned
we'd have concerned
you'd have concerned
they'd have concerned	I'd have been concerning
you'd have been concerning
he'd have been concerning
we'd have been concerning
you'd have been concerning
they'd have been concerning	

Infinitive 	
Imperative 	
Infinitive 	 	Imperative 	 	
to concern 	 	concern
Let's concern
concern 	 	

Participle 	
Present 	Past 	 	 	
concerning	concerned