to understudy
Regular verb: understudy - understudied- understudied

Indicative 	
Present 	Present continuous 	Preterite 	Preterite continuous 	
I understudy
you understudy
she understudies
we understudy
you understudy
they understudy 	I'munderstudying
you'reunderstudying
she'sunderstudying
we'reunderstudying
you'reunderstudying
they'reunderstudying	I understudied
you understudied
she understudied
we understudied
you understudied
they understudied	Iwasunderstudying
youwereunderstudying
shewasunderstudying
wewereunderstudying
youwereunderstudying
theywereunderstudying	
Present perfect 	Present perfect continuous 	Pluperfect 	Pluperfect continuous 	
I've understudied
you've understudied
she's understudied
we've understudied
you've understudied
they've understudied	I'vebeen understudying
you'vebeen understudying
she'sbeen understudying
we'vebeen understudying
you'vebeen understudying
they'vebeen understudying	I'd understudied
you'd understudied
she'd understudied
we'd understudied
you'd understudied
they'd understudied	I'd been understudying
you'd been understudying
she'd been understudying
we'd been understudying
you'd been understudying
they'd been understudying	
Future 	Future continuous 	Future perfect 	Future perfect continuous 	
I'll understudy
you'll understudy
she'll understudy
we'll understudy
you'll understudy
they'll understudy 	I'll be understudying
you'll be understudying
she'll be understudying
we'll be understudying
you'll be understudying
they'll be understudying	I'll have understudied
you'll have understudied
she'll have understudied
we'll have understudied
you'll have understudied
they'll have understudied	I'll have been understudying
you'll have been understudying
she'll have been understudying
we'll have been understudying
you'll have been understudying
they'll have been understudying	

Conditional 	
Present 	Present continuous 	Past 	Past continuous 	
I'd understudy
you'd understudy
she'd understudy
we'd understudy
you'd understudy
they'd understudy 	I'd be understudying
you'd be understudying
she'd be understudying
we'd be understudying
you'd be understudying
they'd be understudying	I'd have understudied
you'd have understudied
she'd have understudied
we'd have understudied
you'd have understudied
they'd have understudied	I'd have been understudying
you'd have been understudying
she'd have been understudying
we'd have been understudying
you'd have been understudying
they'd have been understudying	

Infinitive 	
Imperative 	
Infinitive 	 	Imperative 	 	
to understudy 	 	understudy
Let's understudy
understudy 	 	

Participle 	
Present 	Past 	 	 	
understudying	understudied