I can patch you can patch he can patch we can patch you can patch they can patch
V-ing form
I can be patching you can be patching he can be patching we can be patching you can be patching they can be patching
Perfect
I can have patched you can have patched he can have patched we can have patched you can have patched they can have patched
V-ing perfect
I can have been patching you can have been patching he can have been patching we can have been patching you can have been patching they can have been patching
Negation
Simple form
I cannot patch you cannot patch he cannot patch we cannot patch you cannot patch they cannot patch
V-ing form
I cannot be patching you cannot be patching he cannot be patching we cannot be patching you cannot be patching they cannot be patching
Perfect
I cannot have patched you cannot have patched he cannot have patched we cannot have patched you cannot have patched they cannot have patched
V-ing perfect
I cannot have been patching you cannot have been patching he cannot have been patching we cannot have been patching you cannot have been patching they cannot have been patching
Interrogative form
Simple form
can I patch? can you patch? can he patch? can we patch? can you patch? can they patch?
V-ing form
can I be patching? can you be patching? can he be patching? can we be patching? can you be patching? can they be patching?
Perfect
can I have patched? can you have patched? can he have patched? can we have patched? can you have patched? can they have patched?
V-ing perfect
can I have been patching? can you have been patching? can he have been patching? can we have been patching? can you have been patching? can they have been patching?
Interro-negative form
Simple form
can I not patch? can you not patch? can he not patch? can we not patch? can you not patch? can they not patch?
V-ing form
can I not be patching? can you not be patching? can he not be patching? can we not be patching? can you not be patching? can they not be patching?
Perfect
can I not have patched? can you not have patched? can he not have patched? can we not have patched? can you not have patched? can they not have patched?
V-ing perfect
can I not have been patching? can you not have been patching? can he not have been patching? can we not have been patching? can you not have been patching? can they not have been patching?