I can garden you can garden she can garden we can garden you can garden they can garden
V-ing form
I can be gardening you can be gardening she can be gardening we can be gardening you can be gardening they can be gardening
Perfect
I can have gardened you can have gardened she 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 she can have been gardening we can have been gardening you can have been gardening they can have been gardening
Negation
Simple form
I cannot garden you cannot garden she cannot garden we cannot garden you cannot garden they cannot garden
V-ing form
I cannot be gardening you cannot be gardening she cannot be gardening we cannot be gardening you cannot be gardening they cannot be gardening
Perfect
I cannot have gardened you cannot have gardened she cannot have gardened we cannot have gardened you cannot have gardened they cannot have gardened
V-ing perfect
I cannot have been gardening you cannot have been gardening she cannot have been gardening we cannot have been gardening you cannot have been gardening they cannot have been gardening
Interrogative form
Simple form
can I garden? can you garden? can she garden? can we garden? can you garden? can they garden?
V-ing form
can I be gardening? can you be gardening? can she be gardening? can we be gardening? can you be gardening? can they be gardening?
Perfect
can I have gardened? can you have gardened? can she 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 she have been gardening? can we have been gardening? can you have been gardening? can they have been gardening?
Interro-negative form
Simple form
can I not garden? can you not garden? can she not garden? can we not garden? can you not garden? can they not garden?
V-ing form
can I not be gardening? can you not be gardening? can she not be gardening? can we not be gardening? can you not be gardening? can they not be gardening?
Perfect
can I not have gardened? can you not have gardened? can she not have gardened? can we not have gardened? can you not have gardened? can they not have gardened?
V-ing perfect
can I not have been gardening? can you not have been gardening? can she not have been gardening? can we not have been gardening? can you not have been gardening? can they not have been gardening?