I can stop you can stop he can stop we can stop you can stop they can stop
V-ing form
I can be stopping you can be stopping he can be stopping we can be stopping you can be stopping they can be stopping
Perfect
I can have stopped you can have stopped he can have stopped we can have stopped you can have stopped they can have stopped
V-ing perfect
I can have been stopping you can have been stopping he can have been stopping we can have been stopping you can have been stopping they can have been stopping
Negation
Simple form
I can't stop you can't stop he can't stop we can't stop you can't stop they can't stop
V-ing form
I can't be stopping you can't be stopping he can't be stopping we can't be stopping you can't be stopping they can't be stopping
Perfect
I can't have stopped you can't have stopped he can't have stopped we can't have stopped you can't have stopped they can't have stopped
V-ing perfect
I can't have been stopping you can't have been stopping he can't have been stopping we can't have been stopping you can't have been stopping they can't have been stopping
Interrogative form
Simple form
can I stop? can you stop? can he stop? can we stop? can you stop? can they stop?
V-ing form
can I be stopping? can you be stopping? can he be stopping? can we be stopping? can you be stopping? can they be stopping?
Perfect
can I have stopped? can you have stopped? can he have stopped? can we have stopped? can you have stopped? can they have stopped?
V-ing perfect
can I have been stopping? can you have been stopping? can he have been stopping? can we have been stopping? can you have been stopping? can they have been stopping?
Interro-negative form
Simple form
can't I stop? can't you stop? can't he stop? can't we stop? can't you stop? can't they stop?
V-ing form
can't I be stopping? can't you be stopping? can't he be stopping? can't we be stopping? can't you be stopping? can't they be stopping?
Perfect
can't I have stopped? can't you have stopped? can't he have stopped? can't we have stopped? can't you have stopped? can't they have stopped?
V-ing perfect
can't I have been stopping? can't you have been stopping? can't he have been stopping? can't we have been stopping? can't you have been stopping? can't they have been stopping?