can preserve
Regular verb: preserve - preserved- preserved

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can preserve
you can preserve
she can preserve
we can preserve
you can preserve
they can preserve 	I can be preserving
you can be preserving
she can be preserving
we can be preserving
you can be preserving
they can be preserving	I can have preserved
you can have preserved
she can have preserved
we can have preserved
you can have preserved
they can have preserved	I can have been preserving
you can have been preserving
she can have been preserving
we can have been preserving
you can have been preserving
they can have been preserving	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot preserve
you cannot preserve
she cannot preserve
we cannot preserve
you cannot preserve
they cannot preserve 	I cannot be preserving
you cannot be preserving
she cannot be preserving
we cannot be preserving
you cannot be preserving
they cannot be preserving	I cannot have preserved
you cannot have preserved
she cannot have preserved
we cannot have preserved
you cannot have preserved
they cannot have preserved	I cannot have been preserving
you cannot have been preserving
she cannot have been preserving
we cannot have been preserving
you cannot have been preserving
they cannot have been preserving	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I preserve?
can you preserve?
can she preserve?
can we preserve?
can you preserve?
can they preserve? 	can I be preserving?
can you be preserving?
can she be preserving?
can we be preserving?
can you be preserving?
can they be preserving? 	can I have preserved?
can you have preserved?
can she have preserved?
can we have preserved?
can you have preserved?
can they have preserved? 	can I have been preserving?
can you have been preserving?
can she have been preserving?
can we have been preserving?
can you have been preserving?
can they have been preserving? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not preserve?
can you not preserve?
can she not preserve?
can we not preserve?
can you not preserve?
can they not preserve? 	can I not be preserving?
can you not be preserving?
can she not be preserving?
can we not be preserving?
can you not be preserving?
can they not be preserving? 	can I not have preserved?
can you not have preserved?
can she not have preserved?
can we not have preserved?
can you not have preserved?
can they not have preserved? 	can I not have been preserving?
can you not have been preserving?
can she not have been preserving?
can we not have been preserving?
can you not have been preserving?
can they not have been preserving?