to ascertain
Regular verb: ascertain - ascertained- ascertained

Indicative 	
Present 	Present continuous 	Preterite 	Preterite continuous 	
I ascertain
you ascertain
she ascertains
we ascertain
you ascertain
they ascertain 	I'mascertaining
you'reascertaining
she'sascertaining
we'reascertaining
you'reascertaining
they'reascertaining	I ascertained
you ascertained
she ascertained
we ascertained
you ascertained
they ascertained	Iwasascertaining
youwereascertaining
shewasascertaining
wewereascertaining
youwereascertaining
theywereascertaining	
Present perfect 	Present perfect continuous 	Pluperfect 	Pluperfect continuous 	
I've ascertained
you've ascertained
she's ascertained
we've ascertained
you've ascertained
they've ascertained	I'vebeen ascertaining
you'vebeen ascertaining
she'sbeen ascertaining
we'vebeen ascertaining
you'vebeen ascertaining
they'vebeen ascertaining	I'd ascertained
you'd ascertained
she'd ascertained
we'd ascertained
you'd ascertained
they'd ascertained	I'd been ascertaining
you'd been ascertaining
she'd been ascertaining
we'd been ascertaining
you'd been ascertaining
they'd been ascertaining	
Future 	Future continuous 	Future perfect 	Future perfect continuous 	
I'll ascertain
you'll ascertain
she'll ascertain
we'll ascertain
you'll ascertain
they'll ascertain 	I'll be ascertaining
you'll be ascertaining
she'll be ascertaining
we'll be ascertaining
you'll be ascertaining
they'll be ascertaining	I'll have ascertained
you'll have ascertained
she'll have ascertained
we'll have ascertained
you'll have ascertained
they'll have ascertained	I'll have been ascertaining
you'll have been ascertaining
she'll have been ascertaining
we'll have been ascertaining
you'll have been ascertaining
they'll have been ascertaining	

Conditional 	
Present 	Present continuous 	Past 	Past continuous 	
I'd ascertain
you'd ascertain
she'd ascertain
we'd ascertain
you'd ascertain
they'd ascertain 	I'd be ascertaining
you'd be ascertaining
she'd be ascertaining
we'd be ascertaining
you'd be ascertaining
they'd be ascertaining	I'd have ascertained
you'd have ascertained
she'd have ascertained
we'd have ascertained
you'd have ascertained
they'd have ascertained	I'd have been ascertaining
you'd have been ascertaining
she'd have been ascertaining
we'd have been ascertaining
you'd have been ascertaining
they'd have been ascertaining	

Infinitive 	
Imperative 	
Infinitive 	 	Imperative 	 	
to ascertain 	 	ascertain
Let's ascertain
ascertain 	 	

Participle 	
Present 	Past 	 	 	
ascertaining	ascertained