I can flat you can flat she can flat we can flat you can flat they can flat
V-ing form
I can be flating you can be flating she can be flating we can be flating you can be flating they can be flating
Perfect
I can have flated you can have flated she can have flated we can have flated you can have flated they can have flated
V-ing perfect
I can have been flating you can have been flating she can have been flating we can have been flating you can have been flating they can have been flating
Negation
Simple form
I cannot flat you cannot flat she cannot flat we cannot flat you cannot flat they cannot flat
V-ing form
I cannot be flating you cannot be flating she cannot be flating we cannot be flating you cannot be flating they cannot be flating
Perfect
I cannot have flated you cannot have flated she cannot have flated we cannot have flated you cannot have flated they cannot have flated
V-ing perfect
I cannot have been flating you cannot have been flating she cannot have been flating we cannot have been flating you cannot have been flating they cannot have been flating
Interrogative form
Simple form
can I flat? can you flat? can she flat? can we flat? can you flat? can they flat?
V-ing form
can I be flating? can you be flating? can she be flating? can we be flating? can you be flating? can they be flating?
Perfect
can I have flated? can you have flated? can she have flated? can we have flated? can you have flated? can they have flated?
V-ing perfect
can I have been flating? can you have been flating? can she have been flating? can we have been flating? can you have been flating? can they have been flating?
Interro-negative form
Simple form
can I not flat? can you not flat? can she not flat? can we not flat? can you not flat? can they not flat?
V-ing form
can I not be flating? can you not be flating? can she not be flating? can we not be flating? can you not be flating? can they not be flating?
Perfect
can I not have flated? can you not have flated? can she not have flated? can we not have flated? can you not have flated? can they not have flated?
V-ing perfect
can I not have been flating? can you not have been flating? can she not have been flating? can we not have been flating? can you not have been flating? can they not have been flating?