I can arch you can arch she can arch we can arch you can arch they can arch
V-ing form
I can be arching you can be arching she can be arching we can be arching you can be arching they can be arching
Perfect
I can have arched you can have arched she can have arched we can have arched you can have arched they can have arched
V-ing perfect
I can have been arching you can have been arching she can have been arching we can have been arching you can have been arching they can have been arching
Negation
Simple form
I can't arch you can't arch she can't arch we can't arch you can't arch they can't arch
V-ing form
I can't be arching you can't be arching she can't be arching we can't be arching you can't be arching they can't be arching
Perfect
I can't have arched you can't have arched she can't have arched we can't have arched you can't have arched they can't have arched
V-ing perfect
I can't have been arching you can't have been arching she can't have been arching we can't have been arching you can't have been arching they can't have been arching
Interrogative form
Simple form
can I arch? can you arch? can she arch? can we arch? can you arch? can they arch?
V-ing form
can I be arching? can you be arching? can she be arching? can we be arching? can you be arching? can they be arching?
Perfect
can I have arched? can you have arched? can she have arched? can we have arched? can you have arched? can they have arched?
V-ing perfect
can I have been arching? can you have been arching? can she have been arching? can we have been arching? can you have been arching? can they have been arching?
Interro-negative form
Simple form
can't I arch? can't you arch? can't she arch? can't we arch? can't you arch? can't they arch?
V-ing form
can't I be arching? can't you be arching? can't she be arching? can't we be arching? can't you be arching? can't they be arching?
Perfect
can't I have arched? can't you have arched? can't she have arched? can't we have arched? can't you have arched? can't they have arched?
V-ing perfect
can't I have been arching? can't you have been arching? can't she have been arching? can't we have been arching? can't you have been arching? can't they have been arching?