to stiffen
Regular verb: stiffen - stiffened- stiffened

Indicative 	
Present 	Present continuous 	Preterite 	Preterite continuous 	
I don't stiffen
you don't stiffen
he doesn't stiffen
we don't stiffen
you don't stiffen
they don't stiffen 	I'mnot stiffening
youaren't stiffening
heisn't stiffening
wearen't stiffening
youaren't stiffening
theyaren't stiffening	I didn't stiffen
you didn't stiffen
he didn't stiffen
we didn't stiffen
you didn't stiffen
they didn't stiffen 	Iwasn't stiffening
youweren't stiffening
hewasn't stiffening
weweren't stiffening
youweren't stiffening
theyweren't stiffening	
Present perfect 	Present perfect continuous 	Pluperfect 	Pluperfect continuous 	
I haven't stiffened
you haven't stiffened
he hasn't stiffened
we haven't stiffened
you haven't stiffened
they haven't stiffened	I haven't  been stiffening
you haven't  been stiffening
he hasn't  been stiffening
we haven't  been stiffening
you haven't  been stiffening
they haven't  been stiffening	I hadn't stiffened
you hadn't stiffened
he hadn't stiffened
we hadn't stiffened
you hadn't stiffened
they hadn't stiffened	I hadn't been stiffening
you hadn't been stiffening
he hadn't been stiffening
we hadn't been stiffening
you hadn't been stiffening
they hadn't been stiffening	
Future 	Future continuous 	Future perfect 	Future perfect continuous 	
I won't stiffen
you won't stiffen
he won't stiffen
we won't stiffen
you won't stiffen
they won't stiffen 	I won't be stiffening
you won't be stiffening
he won't be stiffening
we won't be stiffening
you won't be stiffening
they won't be stiffening	I won't have stiffened
you won't have stiffened
he won't have stiffened
we won't have stiffened
you won't have stiffened
they won't have stiffened	I won't have been stiffening
you won't have been stiffening
he won't have been stiffening
we won't have been stiffening
you won't have been stiffening
they won't have been stiffening	

Conditional 	
Present 	Present continuous 	Past 	Past continuous 	
I wouldn't stiffen
you wouldn't stiffen
he wouldn't stiffen
we wouldn't stiffen
you wouldn't stiffen
they wouldn't stiffen 	I wouldn't be stiffening
you wouldn't be stiffening
he wouldn't be stiffening
we wouldn't be stiffening
you wouldn't be stiffening
they wouldn't be stiffening	I wouldn't have stiffened
you wouldn't have stiffened
he wouldn't have stiffened
we wouldn't have stiffened
you wouldn't have stiffened
they wouldn't have stiffened	I wouldn't have been stiffening
you wouldn't have been stiffening
he wouldn't have been stiffening
we wouldn't have been stiffening
you wouldn't have been stiffening
they wouldn't have been stiffening	

Infinitive 	
Imperative 	
Infinitive 	 	Imperative 	 	
to stiffen 	 	do not stiffen
Let's not stiffen
do not stiffen 	 	

Participle 	
Present 	Past 	 	 	
stiffening	stiffened