I can diphthongize you can diphthongize he can diphthongize we can diphthongize you can diphthongize they can diphthongize
V-ing form
I can be diphthongizing you can be diphthongizing he can be diphthongizing we can be diphthongizing you can be diphthongizing they can be diphthongizing
Perfect
I can have diphthongized you can have diphthongized he can have diphthongized we can have diphthongized you can have diphthongized they can have diphthongized
V-ing perfect
I can have been diphthongizing you can have been diphthongizing he can have been diphthongizing we can have been diphthongizing you can have been diphthongizing they can have been diphthongizing
Negation
Simple form
I can't diphthongize you can't diphthongize he can't diphthongize we can't diphthongize you can't diphthongize they can't diphthongize
V-ing form
I can't be diphthongizing you can't be diphthongizing he can't be diphthongizing we can't be diphthongizing you can't be diphthongizing they can't be diphthongizing
Perfect
I can't have diphthongized you can't have diphthongized he can't have diphthongized we can't have diphthongized you can't have diphthongized they can't have diphthongized
V-ing perfect
I can't have been diphthongizing you can't have been diphthongizing he can't have been diphthongizing we can't have been diphthongizing you can't have been diphthongizing they can't have been diphthongizing
Interrogative form
Simple form
can I diphthongize? can you diphthongize? can he diphthongize? can we diphthongize? can you diphthongize? can they diphthongize?
V-ing form
can I be diphthongizing? can you be diphthongizing? can he be diphthongizing? can we be diphthongizing? can you be diphthongizing? can they be diphthongizing?
Perfect
can I have diphthongized? can you have diphthongized? can he have diphthongized? can we have diphthongized? can you have diphthongized? can they have diphthongized?
V-ing perfect
can I have been diphthongizing? can you have been diphthongizing? can he have been diphthongizing? can we have been diphthongizing? can you have been diphthongizing? can they have been diphthongizing?
Interro-negative form
Simple form
can't I diphthongize? can't you diphthongize? can't he diphthongize? can't we diphthongize? can't you diphthongize? can't they diphthongize?
V-ing form
can't I be diphthongizing? can't you be diphthongizing? can't he be diphthongizing? can't we be diphthongizing? can't you be diphthongizing? can't they be diphthongizing?
Perfect
can't I have diphthongized? can't you have diphthongized? can't he have diphthongized? can't we have diphthongized? can't you have diphthongized? can't they have diphthongized?
V-ing perfect
can't I have been diphthongizing? can't you have been diphthongizing? can't he have been diphthongizing? can't we have been diphthongizing? can't you have been diphthongizing? can't they have been diphthongizing?