I can skip you can skip he can skip we can skip you can skip they can skip
V-ing form
I can be skipping you can be skipping he can be skipping we can be skipping you can be skipping they can be skipping
Perfect
I can have skipped you can have skipped he can have skipped we can have skipped you can have skipped they can have skipped
V-ing perfect
I can have been skipping you can have been skipping he can have been skipping we can have been skipping you can have been skipping they can have been skipping
Negation
Simple form
I can't skip you can't skip he can't skip we can't skip you can't skip they can't skip
V-ing form
I can't be skipping you can't be skipping he can't be skipping we can't be skipping you can't be skipping they can't be skipping
Perfect
I can't have skipped you can't have skipped he can't have skipped we can't have skipped you can't have skipped they can't have skipped
V-ing perfect
I can't have been skipping you can't have been skipping he can't have been skipping we can't have been skipping you can't have been skipping they can't have been skipping
Interrogative form
Simple form
can I skip? can you skip? can he skip? can we skip? can you skip? can they skip?
V-ing form
can I be skipping? can you be skipping? can he be skipping? can we be skipping? can you be skipping? can they be skipping?
Perfect
can I have skipped? can you have skipped? can he have skipped? can we have skipped? can you have skipped? can they have skipped?
V-ing perfect
can I have been skipping? can you have been skipping? can he have been skipping? can we have been skipping? can you have been skipping? can they have been skipping?
Interro-negative form
Simple form
can't I skip? can't you skip? can't he skip? can't we skip? can't you skip? can't they skip?
V-ing form
can't I be skipping? can't you be skipping? can't he be skipping? can't we be skipping? can't you be skipping? can't they be skipping?
Perfect
can't I have skipped? can't you have skipped? can't he have skipped? can't we have skipped? can't you have skipped? can't they have skipped?
V-ing perfect
can't I have been skipping? can't you have been skipping? can't he have been skipping? can't we have been skipping? can't you have been skipping? can't they have been skipping?