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 couldn't diphthongise
you couldn't diphthongise
he couldn't diphthongise
we couldn't diphthongise
you couldn't diphthongise
they couldn't diphthongise

V-ing form

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

Perfect

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

V-ing perfect

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

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

V-ing form

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

Perfect

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

V-ing perfect

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

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