I can test you can test he can test we can test you can test they can test
V-ing form
I can be testing you can be testing he can be testing we can be testing you can be testing they can be testing
Perfect
I can have tested you can have tested he can have tested we can have tested you can have tested they can have tested
V-ing perfect
I can have been testing you can have been testing he can have been testing we can have been testing you can have been testing they can have been testing
Negation
Simple form
I cannot test you cannot test he cannot test we cannot test you cannot test they cannot test
V-ing form
I cannot be testing you cannot be testing he cannot be testing we cannot be testing you cannot be testing they cannot be testing
Perfect
I cannot have tested you cannot have tested he cannot have tested we cannot have tested you cannot have tested they cannot have tested
V-ing perfect
I cannot have been testing you cannot have been testing he cannot have been testing we cannot have been testing you cannot have been testing they cannot have been testing
Interrogative form
Simple form
can I test? can you test? can he test? can we test? can you test? can they test?
V-ing form
can I be testing? can you be testing? can he be testing? can we be testing? can you be testing? can they be testing?
Perfect
can I have tested? can you have tested? can he have tested? can we have tested? can you have tested? can they have tested?
V-ing perfect
can I have been testing? can you have been testing? can he have been testing? can we have been testing? can you have been testing? can they have been testing?
Interro-negative form
Simple form
can I not test? can you not test? can he not test? can we not test? can you not test? can they not test?
V-ing form
can I not be testing? can you not be testing? can he not be testing? can we not be testing? can you not be testing? can they not be testing?
Perfect
can I not have tested? can you not have tested? can he not have tested? can we not have tested? can you not have tested? can they not have tested?
V-ing perfect
can I not have been testing? can you not have been testing? can he not have been testing? can we not have been testing? can you not have been testing? can they not have been testing?