I can aver you can aver he can aver we can aver you can aver they can aver
V-ing form
I can be averring you can be averring he can be averring we can be averring you can be averring they can be averring
Perfect
I can have averred you can have averred he can have averred we can have averred you can have averred they can have averred
V-ing perfect
I can have been averring you can have been averring he can have been averring we can have been averring you can have been averring they can have been averring
Negation
Simple form
I cannot aver you cannot aver he cannot aver we cannot aver you cannot aver they cannot aver
V-ing form
I cannot be averring you cannot be averring he cannot be averring we cannot be averring you cannot be averring they cannot be averring
Perfect
I cannot have averred you cannot have averred he cannot have averred we cannot have averred you cannot have averred they cannot have averred
V-ing perfect
I cannot have been averring you cannot have been averring he cannot have been averring we cannot have been averring you cannot have been averring they cannot have been averring
Interrogative form
Simple form
can I aver? can you aver? can he aver? can we aver? can you aver? can they aver?
V-ing form
can I be averring? can you be averring? can he be averring? can we be averring? can you be averring? can they be averring?
Perfect
can I have averred? can you have averred? can he have averred? can we have averred? can you have averred? can they have averred?
V-ing perfect
can I have been averring? can you have been averring? can he have been averring? can we have been averring? can you have been averring? can they have been averring?
Interro-negative form
Simple form
can I not aver? can you not aver? can he not aver? can we not aver? can you not aver? can they not aver?
V-ing form
can I not be averring? can you not be averring? can he not be averring? can we not be averring? can you not be averring? can they not be averring?
Perfect
can I not have averred? can you not have averred? can he not have averred? can we not have averred? can you not have averred? can they not have averred?
V-ing perfect
can I not have been averring? can you not have been averring? can he not have been averring? can we not have been averring? can you not have been averring? can they not have been averring?