I can seed you can seed she can seed we can seed you can seed they can seed
V-ing form
I can be seeding you can be seeding she can be seeding we can be seeding you can be seeding they can be seeding
Perfect
I can have seeded you can have seeded she can have seeded we can have seeded you can have seeded they can have seeded
V-ing perfect
I can have been seeding you can have been seeding she can have been seeding we can have been seeding you can have been seeding they can have been seeding
Negation
Simple form
I can't seed you can't seed she can't seed we can't seed you can't seed they can't seed
V-ing form
I can't be seeding you can't be seeding she can't be seeding we can't be seeding you can't be seeding they can't be seeding
Perfect
I can't have seeded you can't have seeded she can't have seeded we can't have seeded you can't have seeded they can't have seeded
V-ing perfect
I can't have been seeding you can't have been seeding she can't have been seeding we can't have been seeding you can't have been seeding they can't have been seeding
Interrogative form
Simple form
can I seed? can you seed? can she seed? can we seed? can you seed? can they seed?
V-ing form
can I be seeding? can you be seeding? can she be seeding? can we be seeding? can you be seeding? can they be seeding?
Perfect
can I have seeded? can you have seeded? can she have seeded? can we have seeded? can you have seeded? can they have seeded?
V-ing perfect
can I have been seeding? can you have been seeding? can she have been seeding? can we have been seeding? can you have been seeding? can they have been seeding?
Interro-negative form
Simple form
can't I seed? can't you seed? can't she seed? can't we seed? can't you seed? can't they seed?
V-ing form
can't I be seeding? can't you be seeding? can't she be seeding? can't we be seeding? can't you be seeding? can't they be seeding?
Perfect
can't I have seeded? can't you have seeded? can't she have seeded? can't we have seeded? can't you have seeded? can't they have seeded?
V-ing perfect
can't I have been seeding? can't you have been seeding? can't she have been seeding? can't we have been seeding? can't you have been seeding? can't they have been seeding?