to strengthen
Regular verb: strengthen - strengthened- strengthened

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

Conditional 	
Present 	Present continuous 	Past 	Past continuous 	
I wouldn't strengthen
you wouldn't strengthen
he wouldn't strengthen
we wouldn't strengthen
you wouldn't strengthen
they wouldn't strengthen 	I wouldn't be strengthening
you wouldn't be strengthening
he wouldn't be strengthening
we wouldn't be strengthening
you wouldn't be strengthening
they wouldn't be strengthening	I wouldn't have strengthened
you wouldn't have strengthened
he wouldn't have strengthened
we wouldn't have strengthened
you wouldn't have strengthened
they wouldn't have strengthened	I wouldn't have been strengthening
you wouldn't have been strengthening
he wouldn't have been strengthening
we wouldn't have been strengthening
you wouldn't have been strengthening
they wouldn't have been strengthening	

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

Participle 	
Present 	Past 	 	 	
strengthening	strengthened