I can preserve you can preserve she can preserve we can preserve you can preserve they can preserve
V-ing form
I can be preserving you can be preserving she can be preserving we can be preserving you can be preserving they can be preserving
Perfect
I can have preserved you can have preserved she can have preserved we can have preserved you can have preserved they can have preserved
V-ing perfect
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
I can't preserve you can't preserve she can't preserve we can't preserve you can't preserve they can't preserve
V-ing form
I can't be preserving you can't be preserving she can't be preserving we can't be preserving you can't be preserving they can't be preserving
Perfect
I can't have preserved you can't have preserved she can't have preserved we can't have preserved you can't have preserved they can't have preserved
V-ing perfect
I can't have been preserving you can't have been preserving she can't have been preserving we can't have been preserving you can't have been preserving they can't have been preserving
Interrogative form
Simple form
can I preserve? can you preserve? can she preserve? can we preserve? can you preserve? can they preserve?
V-ing form
can I be preserving? can you be preserving? can she be preserving? can we be preserving? can you be preserving? can they be preserving?
Perfect
can I have preserved? can you have preserved? can she have preserved? can we have preserved? can you have preserved? can they have preserved?
V-ing perfect
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
can't I preserve? can't you preserve? can't she preserve? can't we preserve? can't you preserve? can't they preserve?
V-ing form
can't I be preserving? can't you be preserving? can't she be preserving? can't we be preserving? can't you be preserving? can't they be preserving?
Perfect
can't I have preserved? can't you have preserved? can't she have preserved? can't we have preserved? can't you have preserved? can't they have preserved?
V-ing perfect
can't I have been preserving? can't you have been preserving? can't she have been preserving? can't we have been preserving? can't you have been preserving? can't they have been preserving?