English verb conjugation COULD DIPHTHONGIZE

Regular verb: diphthongize - diphthongized - diphthongized

Affirmation

Simple form

I could diphthongize
you could diphthongize
he could diphthongize
we could diphthongize
you could diphthongize
they could diphthongize

V-ing form

I could be diphthongizing
you could be diphthongizing
he could be diphthongizing
we could be diphthongizing
you could be diphthongizing
they could be diphthongizing

Perfect

I could have diphthongized
you could have diphthongized
he could have diphthongized
we could have diphthongized
you could have diphthongized
they could have diphthongized

V-ing perfect

I could have been diphthongizing
you could have been diphthongizing
he could have been diphthongizing
we could have been diphthongizing
you could have been diphthongizing
they could have been diphthongizing

Negation

Simple form

I could not diphthongize
you could not diphthongize
he could not diphthongize
we could not diphthongize
you could not diphthongize
they could not diphthongize

V-ing form

I could not be diphthongizing
you could not be diphthongizing
he could not be diphthongizing
we could not be diphthongizing
you could not be diphthongizing
they could not be diphthongizing

Perfect

I could not have diphthongized
you could not have diphthongized
he could not have diphthongized
we could not have diphthongized
you could not have diphthongized
they could not have diphthongized

V-ing perfect

I could not have been diphthongizing
you could not have been diphthongizing
he could not have been diphthongizing
we could not have been diphthongizing
you could not have been diphthongizing
they could not have been diphthongizing

Interrogative form

Simple form

could I diphthongize?
could you diphthongize?
could he diphthongize?
could we diphthongize?
could you diphthongize?
could they diphthongize?

V-ing form

could I be diphthongizing?
could you be diphthongizing?
could he be diphthongizing?
could we be diphthongizing?
could you be diphthongizing?
could they be diphthongizing?

Perfect

could I have diphthongized?
could you have diphthongized?
could he have diphthongized?
could we have diphthongized?
could you have diphthongized?
could they have diphthongized?

V-ing perfect

could I have been diphthongizing?
could you have been diphthongizing?
could he have been diphthongizing?
could we have been diphthongizing?
could you have been diphthongizing?
could they have been diphthongizing?

Interro-negative form

Simple form

could I not diphthongize?
could you not diphthongize?
could he not diphthongize?
could we not diphthongize?
could you not diphthongize?
could they not diphthongize?

V-ing form

could I not be diphthongizing?
could you not be diphthongizing?
could he not be diphthongizing?
could we not be diphthongizing?
could you not be diphthongizing?
could they not be diphthongizing?

Perfect

could I not have diphthongized?
could you not have diphthongized?
could he not have diphthongized?
could we not have diphthongized?
could you not have diphthongized?
could they not have diphthongized?

V-ing perfect

could I not have been diphthongizing?
could you not have been diphthongizing?
could he not have been diphthongizing?
could we not have been diphthongizing?
could you not have been diphthongizing?
could they not have been diphthongizing?

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