must acidify
Regular verb: acidify - acidified- acidified

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must acidify
you must acidify
she must acidify
we must acidify
you must acidify
they must acidify 	I must be acidifying
you must be acidifying
she must be acidifying
we must be acidifying
you must be acidifying
they must be acidifying	I must have acidified
you must have acidified
she must have acidified
we must have acidified
you must have acidified
they must have acidified	I must have been acidifying
you must have been acidifying
she must have been acidifying
we must have been acidifying
you must have been acidifying
they must have been acidifying	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not acidify
you must not acidify
she must not acidify
we must not acidify
you must not acidify
they must not acidify 	I must not be acidifying
you must not be acidifying
she must not be acidifying
we must not be acidifying
you must not be acidifying
they must not be acidifying	I must not have acidified
you must not have acidified
she must not have acidified
we must not have acidified
you must not have acidified
they must not have acidified	I must not have been acidifying
you must not have been acidifying
she must not have been acidifying
we must not have been acidifying
you must not have been acidifying
they must not have been acidifying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I acidify?
must you acidify?
must she acidify?
must we acidify?
must you acidify?
must they acidify? 	must I be acidifying?
must you be acidifying?
must she be acidifying?
must we be acidifying?
must you be acidifying?
must they be acidifying? 	must I have acidified?
must you have acidified?
must she have acidified?
must we have acidified?
must you have acidified?
must they have acidified? 	must I have been acidifying?
must you have been acidifying?
must she have been acidifying?
must we have been acidifying?
must you have been acidifying?
must they have been acidifying? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not acidify?
must you not acidify?
must she not acidify?
must we not acidify?
must you not acidify?
must they not acidify? 	must I not be acidifying?
must you not be acidifying?
must she not be acidifying?
must we not be acidifying?
must you not be acidifying?
must they not be acidifying? 	must I not have acidified?
must you not have acidified?
must she not have acidified?
must we not have acidified?
must you not have acidified?
must they not have acidified? 	must I not have been acidifying?
must you not have been acidifying?
must she not have been acidifying?
must we not have been acidifying?
must you not have been acidifying?
must they not have been acidifying?