I can diphthongize you can diphthongize she can diphthongize we can diphthongize you can diphthongize they can diphthongize
V-ing form
I can be diphthongizing you can be diphthongizing she can be diphthongizing we can be diphthongizing you can be diphthongizing they can be diphthongizing
Perfect
I can have diphthongized you can have diphthongized she 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 she 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 she 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 she 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 she 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 she 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 she diphthongize? can we diphthongize? can you diphthongize? can they diphthongize?
V-ing form
can I be diphthongizing? can you be diphthongizing? can she be diphthongizing? can we be diphthongizing? can you be diphthongizing? can they be diphthongizing?
Perfect
can I have diphthongized? can you have diphthongized? can she 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 she 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 she 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 she 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 she 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 she have been diphthongizing? can't we have been diphthongizing? can't you have been diphthongizing? can't they have been diphthongizing?