must gasify
Regular verb: gasify - gasified- gasified

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must gasify
you must gasify
he must gasify
we must gasify
you must gasify
they must gasify 	I must be gasifying
you must be gasifying
he must be gasifying
we must be gasifying
you must be gasifying
they must be gasifying	I must have gasified
you must have gasified
he must have gasified
we must have gasified
you must have gasified
they must have gasified	I must have been gasifying
you must have been gasifying
he must have been gasifying
we must have been gasifying
you must have been gasifying
they must have been gasifying	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't gasify
you mustn't gasify
he mustn't gasify
we mustn't gasify
you mustn't gasify
they mustn't gasify 	I mustn't be gasifying
you mustn't be gasifying
he mustn't be gasifying
we mustn't be gasifying
you mustn't be gasifying
they mustn't be gasifying	I mustn't have gasified
you mustn't have gasified
he mustn't have gasified
we mustn't have gasified
you mustn't have gasified
they mustn't have gasified	I mustn't have been gasifying
you mustn't have been gasifying
he mustn't have been gasifying
we mustn't have been gasifying
you mustn't have been gasifying
they mustn't have been gasifying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I gasify?
must you gasify?
must he gasify?
must we gasify?
must you gasify?
must they gasify? 	must I be gasifying?
must you be gasifying?
must he be gasifying?
must we be gasifying?
must you be gasifying?
must they be gasifying? 	must I have gasified?
must you have gasified?
must he have gasified?
must we have gasified?
must you have gasified?
must they have gasified? 	must I have been gasifying?
must you have been gasifying?
must he have been gasifying?
must we have been gasifying?
must you have been gasifying?
must they have been gasifying? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I gasify?
mustn't you gasify?
mustn't he gasify?
mustn't we gasify?
mustn't you gasify?
mustn't they gasify? 	mustn't I be gasifying?
mustn't you be gasifying?
mustn't he be gasifying?
mustn't we be gasifying?
mustn't you be gasifying?
mustn't they be gasifying? 	mustn't I have gasified?
mustn't you have gasified?
mustn't he have gasified?
mustn't we have gasified?
mustn't you have gasified?
mustn't they have gasified? 	mustn't I have been gasifying?
mustn't you have been gasifying?
mustn't he have been gasifying?
mustn't we have been gasifying?
mustn't you have been gasifying?
mustn't they have been gasifying?