can stratify
Regular verb: stratify - stratified- stratified

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can stratify
you can stratify
he can stratify
we can stratify
you can stratify
they can stratify 	I can be stratifying
you can be stratifying
he can be stratifying
we can be stratifying
you can be stratifying
they can be stratifying	I can have stratified
you can have stratified
he can have stratified
we can have stratified
you can have stratified
they can have stratified	I can have been stratifying
you can have been stratifying
he can have been stratifying
we can have been stratifying
you can have been stratifying
they can have been stratifying	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't stratify
you can't stratify
he can't stratify
we can't stratify
you can't stratify
they can't stratify 	I can't be stratifying
you can't be stratifying
he can't be stratifying
we can't be stratifying
you can't be stratifying
they can't be stratifying	I can't have stratified
you can't have stratified
he can't have stratified
we can't have stratified
you can't have stratified
they can't have stratified	I can't have been stratifying
you can't have been stratifying
he can't have been stratifying
we can't have been stratifying
you can't have been stratifying
they can't have been stratifying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I stratify?
can you stratify?
can he stratify?
can we stratify?
can you stratify?
can they stratify? 	can I be stratifying?
can you be stratifying?
can he be stratifying?
can we be stratifying?
can you be stratifying?
can they be stratifying? 	can I have stratified?
can you have stratified?
can he have stratified?
can we have stratified?
can you have stratified?
can they have stratified? 	can I have been stratifying?
can you have been stratifying?
can he have been stratifying?
can we have been stratifying?
can you have been stratifying?
can they have been stratifying? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I stratify?
can't you stratify?
can't he stratify?
can't we stratify?
can't you stratify?
can't they stratify? 	can't I be stratifying?
can't you be stratifying?
can't he be stratifying?
can't we be stratifying?
can't you be stratifying?
can't they be stratifying? 	can't I have stratified?
can't you have stratified?
can't he have stratified?
can't we have stratified?
can't you have stratified?
can't they have stratified? 	can't I have been stratifying?
can't you have been stratifying?
can't he have been stratifying?
can't we have been stratifying?
can't you have been stratifying?
can't they have been stratifying?