to concentrate
Regular verb: concentrate - concentrated- concentrated

Indicative 	
Present 	Present continuous 	Preterite 	Preterite continuous 	
I concentrate
you concentrate
he concentrates
we concentrate
you concentrate
they concentrate 	I'mconcentrating
you'reconcentrating
he'sconcentrating
we'reconcentrating
you'reconcentrating
they'reconcentrating	I concentrated
you concentrated
he concentrated
we concentrated
you concentrated
they concentrated	Iwasconcentrating
youwereconcentrating
hewasconcentrating
wewereconcentrating
youwereconcentrating
theywereconcentrating	
Present perfect 	Present perfect continuous 	Pluperfect 	Pluperfect continuous 	
I've concentrated
you've concentrated
he's concentrated
we've concentrated
you've concentrated
they've concentrated	I'vebeen concentrating
you'vebeen concentrating
he'sbeen concentrating
we'vebeen concentrating
you'vebeen concentrating
they'vebeen concentrating	I'd concentrated
you'd concentrated
he'd concentrated
we'd concentrated
you'd concentrated
they'd concentrated	I'd been concentrating
you'd been concentrating
he'd been concentrating
we'd been concentrating
you'd been concentrating
they'd been concentrating	
Future 	Future continuous 	Future perfect 	Future perfect continuous 	
I'll concentrate
you'll concentrate
he'll concentrate
we'll concentrate
you'll concentrate
they'll concentrate 	I'll be concentrating
you'll be concentrating
he'll be concentrating
we'll be concentrating
you'll be concentrating
they'll be concentrating	I'll have concentrated
you'll have concentrated
he'll have concentrated
we'll have concentrated
you'll have concentrated
they'll have concentrated	I'll have been concentrating
you'll have been concentrating
he'll have been concentrating
we'll have been concentrating
you'll have been concentrating
they'll have been concentrating	

Conditional 	
Present 	Present continuous 	Past 	Past continuous 	
I'd concentrate
you'd concentrate
he'd concentrate
we'd concentrate
you'd concentrate
they'd concentrate 	I'd be concentrating
you'd be concentrating
he'd be concentrating
we'd be concentrating
you'd be concentrating
they'd be concentrating	I'd have concentrated
you'd have concentrated
he'd have concentrated
we'd have concentrated
you'd have concentrated
they'd have concentrated	I'd have been concentrating
you'd have been concentrating
he'd have been concentrating
we'd have been concentrating
you'd have been concentrating
they'd have been concentrating	

Infinitive 	
Imperative 	
Infinitive 	 	Imperative 	 	
to concentrate 	 	concentrate
Let's concentrate
concentrate 	 	

Participle 	
Present 	Past 	 	 	
concentrating	concentrated