English verb conjugation COULD DIPHTHONGISE

Regular verb: diphthongise - diphthongised - diphthongised

Affirmation

Simple form

I could diphthongise
you could diphthongise
he could diphthongise
we could diphthongise
you could diphthongise
they could diphthongise

V-ing form

I could be diphthongising
you could be diphthongising
he could be diphthongising
we could be diphthongising
you could be diphthongising
they could be diphthongising

Perfect

I could have diphthongised
you could have diphthongised
he could have diphthongised
we could have diphthongised
you could have diphthongised
they could have diphthongised

V-ing perfect

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

Negation

Simple form

I could not diphthongise
you could not diphthongise
he could not diphthongise
we could not diphthongise
you could not diphthongise
they could not diphthongise

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I diphthongise?
could you diphthongise?
could he diphthongise?
could we diphthongise?
could you diphthongise?
could they diphthongise?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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