will slacken
Regular verb: slacken - slackened- slackened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'll slacken
you'll slacken
he'll slacken
we'll slacken
you'll slacken
they'll slacken 	I'll be slackening
you'll be slackening
he'll be slackening
we'll be slackening
you'll be slackening
they'll be slackening	I'll have slackened
you'll have slackened
he'll have slackened
we'll have slackened
you'll have slackened
they'll have slackened	I'll have been slackening
you'll have been slackening
he'll have been slackening
we'll have been slackening
you'll have been slackening
they'll have been slackening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I won't slacken
you won't slacken
he won't slacken
we won't slacken
you won't slacken
they won't slacken 	I won't be slackening
you won't be slackening
he won't be slackening
we won't be slackening
you won't be slackening
they won't be slackening	I won't have slackened
you won't have slackened
he won't have slackened
we won't have slackened
you won't have slackened
they won't have slackened	I won't have been slackening
you won't have been slackening
he won't have been slackening
we won't have been slackening
you won't have been slackening
they won't have been slackening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
will I slacken?
will you slacken?
will he slacken?
will we slacken?
will you slacken?
will they slacken? 	will I be slackening?
will you be slackening?
will he be slackening?
will we be slackening?
will you be slackening?
will they be slackening? 	will I have slackened?
will you have slackened?
will he have slackened?
will we have slackened?
will you have slackened?
will they have slackened? 	will I have been slackening?
will you have been slackening?
will he have been slackening?
will we have been slackening?
will you have been slackening?
will they have been slackening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
won't I slacken?
won't you slacken?
won't he slacken?
won't we slacken?
won't you slacken?
won't they slacken? 	won't I be slackening?
won't you be slackening?
won't he be slackening?
won't we be slackening?
won't you be slackening?
won't they be slackening? 	won't I have slackened?
won't you have slackened?
won't he have slackened?
won't we have slackened?
won't you have slackened?
won't they have slackened? 	won't I have been slackening?
won't you have been slackening?
won't he have been slackening?
won't we have been slackening?
won't you have been slackening?
won't they have been slackening?