I can fetch you can fetch she can fetch we can fetch you can fetch they can fetch
V-ing form
I can be fetching you can be fetching she can be fetching we can be fetching you can be fetching they can be fetching
Perfect
I can have fetched you can have fetched she can have fetched we can have fetched you can have fetched they can have fetched
V-ing perfect
I can have been fetching you can have been fetching she can have been fetching we can have been fetching you can have been fetching they can have been fetching
Negation
Simple form
I can't fetch you can't fetch she can't fetch we can't fetch you can't fetch they can't fetch
V-ing form
I can't be fetching you can't be fetching she can't be fetching we can't be fetching you can't be fetching they can't be fetching
Perfect
I can't have fetched you can't have fetched she can't have fetched we can't have fetched you can't have fetched they can't have fetched
V-ing perfect
I can't have been fetching you can't have been fetching she can't have been fetching we can't have been fetching you can't have been fetching they can't have been fetching
Interrogative form
Simple form
can I fetch? can you fetch? can she fetch? can we fetch? can you fetch? can they fetch?
V-ing form
can I be fetching? can you be fetching? can she be fetching? can we be fetching? can you be fetching? can they be fetching?
Perfect
can I have fetched? can you have fetched? can she have fetched? can we have fetched? can you have fetched? can they have fetched?
V-ing perfect
can I have been fetching? can you have been fetching? can she have been fetching? can we have been fetching? can you have been fetching? can they have been fetching?
Interro-negative form
Simple form
can't I fetch? can't you fetch? can't she fetch? can't we fetch? can't you fetch? can't they fetch?
V-ing form
can't I be fetching? can't you be fetching? can't she be fetching? can't we be fetching? can't you be fetching? can't they be fetching?
Perfect
can't I have fetched? can't you have fetched? can't she have fetched? can't we have fetched? can't you have fetched? can't they have fetched?
V-ing perfect
can't I have been fetching? can't you have been fetching? can't she have been fetching? can't we have been fetching? can't you have been fetching? can't they have been fetching?