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 couldn't diphthongize
you couldn't diphthongize
he couldn't diphthongize
we couldn't diphthongize
you couldn't diphthongize
they couldn't diphthongize

V-ing form

I couldn't be diphthongizing
you couldn't be diphthongizing
he couldn't be diphthongizing
we couldn't be diphthongizing
you couldn't be diphthongizing
they couldn't be diphthongizing

Perfect

I couldn't have diphthongized
you couldn't have diphthongized
he couldn't have diphthongized
we couldn't have diphthongized
you couldn't have diphthongized
they couldn't have diphthongized

V-ing perfect

I couldn't have been diphthongizing
you couldn't have been diphthongizing
he couldn't have been diphthongizing
we couldn't have been diphthongizing
you couldn't have been diphthongizing
they couldn't 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

couldn't I diphthongize?
couldn't you diphthongize?
couldn't he diphthongize?
couldn't we diphthongize?
couldn't you diphthongize?
couldn't they diphthongize?

V-ing form

couldn't I be diphthongizing?
couldn't you be diphthongizing?
couldn't he be diphthongizing?
couldn't we be diphthongizing?
couldn't you be diphthongizing?
couldn't they be diphthongizing?

Perfect

couldn't I have diphthongized?
couldn't you have diphthongized?
couldn't he have diphthongized?
couldn't we have diphthongized?
couldn't you have diphthongized?
couldn't they have diphthongized?

V-ing perfect

couldn't I have been diphthongizing?
couldn't you have been diphthongizing?
couldn't he have been diphthongizing?
couldn't we have been diphthongizing?
couldn't you have been diphthongizing?
couldn't they have been diphthongizing?

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