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 could not mask
you could not mask
he could not mask
we could not mask
you could not mask
they could not mask

V-ing form

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

Perfect

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

V-ing perfect

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

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

V-ing form

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

Perfect

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

V-ing perfect

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

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