I can complete you can complete she can complete we can complete you can complete they can complete
V-ing form
I can be completing you can be completing she can be completing we can be completing you can be completing they can be completing
Perfect
I can have completed you can have completed she can have completed we can have completed you can have completed they can have completed
V-ing perfect
I can have been completing you can have been completing she can have been completing we can have been completing you can have been completing they can have been completing
Negation
Simple form
I can't complete you can't complete she can't complete we can't complete you can't complete they can't complete
V-ing form
I can't be completing you can't be completing she can't be completing we can't be completing you can't be completing they can't be completing
Perfect
I can't have completed you can't have completed she can't have completed we can't have completed you can't have completed they can't have completed
V-ing perfect
I can't have been completing you can't have been completing she can't have been completing we can't have been completing you can't have been completing they can't have been completing
Interrogative form
Simple form
can I complete? can you complete? can she complete? can we complete? can you complete? can they complete?
V-ing form
can I be completing? can you be completing? can she be completing? can we be completing? can you be completing? can they be completing?
Perfect
can I have completed? can you have completed? can she have completed? can we have completed? can you have completed? can they have completed?
V-ing perfect
can I have been completing? can you have been completing? can she have been completing? can we have been completing? can you have been completing? can they have been completing?
Interro-negative form
Simple form
can't I complete? can't you complete? can't she complete? can't we complete? can't you complete? can't they complete?
V-ing form
can't I be completing? can't you be completing? can't she be completing? can't we be completing? can't you be completing? can't they be completing?
Perfect
can't I have completed? can't you have completed? can't she have completed? can't we have completed? can't you have completed? can't they have completed?
V-ing perfect
can't I have been completing? can't you have been completing? can't she have been completing? can't we have been completing? can't you have been completing? can't they have been completing?