English verb conjugation COULD MASK

Regular verb: mask - masked - masked

Affirmation

Simple form

I could mask
you could mask
he could mask
we could mask
you could mask
they could mask

V-ing form

I could be masking
you could be masking
he could be masking
we could be masking
you could be masking
they could be masking

Perfect

I could have masked
you could have masked
he could have masked
we could have masked
you could have masked
they could have masked

V-ing perfect

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

Negation

Simple form

I couldn't mask
you couldn't mask
he couldn't mask
we couldn't mask
you couldn't mask
they couldn't mask

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I mask?
could you mask?
could he mask?
could we mask?
could you mask?
could they mask?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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