will slacken
Regular verb: slacken - slackened- slackened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I will slacken
you will slacken
she will slacken
we will slacken
you will slacken
they will slacken 	I will be slackening
you will be slackening
she will be slackening
we will be slackening
you will be slackening
they will be slackening	I will have slackened
you will have slackened
she will have slackened
we will have slackened
you will have slackened
they will have slackened	I will have been slackening
you will have been slackening
she will have been slackening
we will have been slackening
you will have been slackening
they will have been slackening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I will not slacken
you will not slacken
she will not slacken
we will not slacken
you will not slacken
they will not slacken 	I will not be slackening
you will not be slackening
she will not be slackening
we will not be slackening
you will not be slackening
they will not be slackening	I will not have slackened
you will not have slackened
she will not have slackened
we will not have slackened
you will not have slackened
they will not have slackened	I will not have been slackening
you will not have been slackening
she will not have been slackening
we will not have been slackening
you will not have been slackening
they will not have been slackening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
will I slacken?
will you slacken?
will she slacken?
will we slacken?
will you slacken?
will they slacken? 	will I be slackening?
will you be slackening?
will she be slackening?
will we be slackening?
will you be slackening?
will they be slackening? 	will I have slackened?
will you have slackened?
will she 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 she 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 	
will I not slacken?
will you not slacken?
will she not slacken?
will we not slacken?
will you not slacken?
will they not slacken? 	will I not be slackening?
will you not be slackening?
will she not be slackening?
will we not be slackening?
will you not be slackening?
will they not be slackening? 	will I not have slackened?
will you not have slackened?
will she not have slackened?
will we not have slackened?
will you not have slackened?
will they not have slackened? 	will I not have been slackening?
will you not have been slackening?
will she not have been slackening?
will we not have been slackening?
will you not have been slackening?
will they not have been slackening?