shall slacken
Regular verb: slacken - slackened- slackened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'll slacken
you'll slacken
she'll slacken
we'll slacken
you'll slacken
they'll slacken 	I'll be slackening
you'll be slackening
she'll be slackening
we'll be slackening
you'll be slackening
they'll be slackening	I'll have slackened
you'll have slackened
she'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
she'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 shan't slacken
you shan't slacken
she shan't slacken
we shan't slacken
you shan't slacken
they shan't slacken 	I shan't be slackening
you shan't be slackening
she shan't be slackening
we shan't be slackening
you shan't be slackening
they shan't be slackening	I shan't have slackened
you shan't have slackened
she shan't have slackened
we shan't have slackened
you shan't have slackened
they shan't have slackened	I shan't have been slackening
you shan't have been slackening
she shan't have been slackening
we shan't have been slackening
you shan't have been slackening
they shan't have been slackening	

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

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