English verb conjugation COULD COUNTERCHECK

Regular verb: countercheck - counterchecked - counterchecked

Affirmation

Simple form

I could countercheck
you could countercheck
he could countercheck
we could countercheck
you could countercheck
they could countercheck

V-ing form

I could be counterchecking
you could be counterchecking
he could be counterchecking
we could be counterchecking
you could be counterchecking
they could be counterchecking

Perfect

I could have counterchecked
you could have counterchecked
he could have counterchecked
we could have counterchecked
you could have counterchecked
they could have counterchecked

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I countercheck?
could you countercheck?
could he countercheck?
could we countercheck?
could you countercheck?
could they countercheck?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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