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 can't aver you can't aver he can't aver we can't aver you can't aver they can't aver
V-ing form
I can't be averring you can't be averring he can't be averring we can't be averring you can't be averring they can't be averring
Perfect
I can't have averred you can't have averred he can't have averred we can't have averred you can't have averred they can't have averred
V-ing perfect
I can't have been averring you can't have been averring he can't have been averring we can't have been averring you can't have been averring they can't 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't I aver? can't you aver? can't he aver? can't we aver? can't you aver? can't they aver?
V-ing form
can't I be averring? can't you be averring? can't he be averring? can't we be averring? can't you be averring? can't they be averring?
Perfect
can't I have averred? can't you have averred? can't he have averred? can't we have averred? can't you have averred? can't they have averred?
V-ing perfect
can't I have been averring? can't you have been averring? can't he have been averring? can't we have been averring? can't you have been averring? can't they have been averring?