I can kneel you can kneel he can kneel we can kneel you can kneel they can kneel
V-ing form
I can be kneeling you can be kneeling he can be kneeling we can be kneeling you can be kneeling they can be kneeling
Perfect
I can have kneeled, knelt you can have kneeled, knelt he can have kneeled, knelt we can have kneeled, knelt you can have kneeled, knelt they can have kneeled, knelt
V-ing perfect
I can have been kneeling you can have been kneeling he can have been kneeling we can have been kneeling you can have been kneeling they can have been kneeling
Negation
Simple form
I cannot kneel you cannot kneel he cannot kneel we cannot kneel you cannot kneel they cannot kneel
V-ing form
I cannot be kneeling you cannot be kneeling he cannot be kneeling we cannot be kneeling you cannot be kneeling they cannot be kneeling
Perfect
I cannot have kneeled, knelt you cannot have kneeled, knelt he cannot have kneeled, knelt we cannot have kneeled, knelt you cannot have kneeled, knelt they cannot have kneeled, knelt
V-ing perfect
I cannot have been kneeling you cannot have been kneeling he cannot have been kneeling we cannot have been kneeling you cannot have been kneeling they cannot have been kneeling
Interrogative form
Simple form
can I kneel? can you kneel? can he kneel? can we kneel? can you kneel? can they kneel?
V-ing form
can I be kneeling? can you be kneeling? can he be kneeling? can we be kneeling? can you be kneeling? can they be kneeling?
Perfect
can I have kneeled, knelt? can you have kneeled, knelt? can he have kneeled, knelt? can we have kneeled, knelt? can you have kneeled, knelt? can they have kneeled, knelt?
V-ing perfect
can I have been kneeling? can you have been kneeling? can he have been kneeling? can we have been kneeling? can you have been kneeling? can they have been kneeling?
Interro-negative form
Simple form
can I not kneel? can you not kneel? can he not kneel? can we not kneel? can you not kneel? can they not kneel?
V-ing form
can I not be kneeling? can you not be kneeling? can he not be kneeling? can we not be kneeling? can you not be kneeling? can they not be kneeling?
Perfect
can I not have kneeled, knelt? can you not have kneeled, knelt? can he not have kneeled, knelt? can we not have kneeled, knelt? can you not have kneeled, knelt? can they not have kneeled, knelt?
V-ing perfect
can I not have been kneeling? can you not have been kneeling? can he not have been kneeling? can we not have been kneeling? can you not have been kneeling? can they not have been kneeling?