I can garden you can garden he can garden we can garden you can garden they can garden
V-ing form
I can be gardening you can be gardening he can be gardening we can be gardening you can be gardening they can be gardening
Perfect
I can have gardened you can have gardened he can have gardened we can have gardened you can have gardened they can have gardened
V-ing perfect
I can have been gardening you can have been gardening he can have been gardening we can have been gardening you can have been gardening they can have been gardening
Negation
Simple form
I can't garden you can't garden he can't garden we can't garden you can't garden they can't garden
V-ing form
I can't be gardening you can't be gardening he can't be gardening we can't be gardening you can't be gardening they can't be gardening
Perfect
I can't have gardened you can't have gardened he can't have gardened we can't have gardened you can't have gardened they can't have gardened
V-ing perfect
I can't have been gardening you can't have been gardening he can't have been gardening we can't have been gardening you can't have been gardening they can't have been gardening
Interrogative form
Simple form
can I garden? can you garden? can he garden? can we garden? can you garden? can they garden?
V-ing form
can I be gardening? can you be gardening? can he be gardening? can we be gardening? can you be gardening? can they be gardening?
Perfect
can I have gardened? can you have gardened? can he have gardened? can we have gardened? can you have gardened? can they have gardened?
V-ing perfect
can I have been gardening? can you have been gardening? can he have been gardening? can we have been gardening? can you have been gardening? can they have been gardening?
Interro-negative form
Simple form
can't I garden? can't you garden? can't he garden? can't we garden? can't you garden? can't they garden?
V-ing form
can't I be gardening? can't you be gardening? can't he be gardening? can't we be gardening? can't you be gardening? can't they be gardening?
Perfect
can't I have gardened? can't you have gardened? can't he have gardened? can't we have gardened? can't you have gardened? can't they have gardened?
V-ing perfect
can't I have been gardening? can't you have been gardening? can't he have been gardening? can't we have been gardening? can't you have been gardening? can't they have been gardening?