must slacken
Verbo regolare: slacken - slackened- slackened

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must slacken
you must slacken
he must slacken
we must slacken
you must slacken
they must slacken 	I must be slackening
you must be slackening
he must be slackening
we must be slackening
you must be slackening
they must be slackening	I must have slackened
you must have slackened
he must have slackened
we must have slackened
you must have slackened
they must have slackened	I must have been slackening
you must have been slackening
he must have been slackening
we must have been slackening
you must have been slackening
they must have been slackening	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must not slacken
you must not slacken
he must not slacken
we must not slacken
you must not slacken
they must not slacken 	I must not be slackening
you must not be slackening
he must not be slackening
we must not be slackening
you must not be slackening
they must not be slackening	I must not have slackened
you must not have slackened
he must not have slackened
we must not have slackened
you must not have slackened
they must not have slackened	I must not have been slackening
you must not have been slackening
he must not have been slackening
we must not have been slackening
you must not have been slackening
they must not have been slackening	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I slacken?
must you slacken?
must he slacken?
must we slacken?
must you slacken?
must they slacken? 	must I be slackening?
must you be slackening?
must he be slackening?
must we be slackening?
must you be slackening?
must they be slackening? 	must I have slackened?
must you have slackened?
must he have slackened?
must we have slackened?
must you have slackened?
must they have slackened? 	must I have been slackening?
must you have been slackening?
must he have been slackening?
must we have been slackening?
must you have been slackening?
must they have been slackening? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I not slacken?
must you not slacken?
must he not slacken?
must we not slacken?
must you not slacken?
must they not slacken? 	must I not be slackening?
must you not be slackening?
must he not be slackening?
must we not be slackening?
must you not be slackening?
must they not be slackening? 	must I not have slackened?
must you not have slackened?
must he not have slackened?
must we not have slackened?
must you not have slackened?
must they not have slackened? 	must I not have been slackening?
must you not have been slackening?
must he not have been slackening?
must we not have been slackening?
must you not have been slackening?
must they not have been slackening?