English verb conjugation CAN COUNTERSIGN

Regular verb: countersign - countersigned - countersigned

Affirmation

Simple form

I can countersign
you can countersign
he can countersign
we can countersign
you can countersign
they can countersign

V-ing form

I can be countersigning
you can be countersigning
he can be countersigning
we can be countersigning
you can be countersigning
they can be countersigning

Perfect

I can have countersigned
you can have countersigned
he can have countersigned
we can have countersigned
you can have countersigned
they can have countersigned

V-ing perfect

I can have been countersigning
you can have been countersigning
he can have been countersigning
we can have been countersigning
you can have been countersigning
they can have been countersigning

Negation

Simple form

I can't countersign
you can't countersign
he can't countersign
we can't countersign
you can't countersign
they can't countersign

V-ing form

I can't be countersigning
you can't be countersigning
he can't be countersigning
we can't be countersigning
you can't be countersigning
they can't be countersigning

Perfect

I can't have countersigned
you can't have countersigned
he can't have countersigned
we can't have countersigned
you can't have countersigned
they can't have countersigned

V-ing perfect

I can't have been countersigning
you can't have been countersigning
he can't have been countersigning
we can't have been countersigning
you can't have been countersigning
they can't have been countersigning

Interrogative form

Simple form

can I countersign?
can you countersign?
can he countersign?
can we countersign?
can you countersign?
can they countersign?

V-ing form

can I be countersigning?
can you be countersigning?
can he be countersigning?
can we be countersigning?
can you be countersigning?
can they be countersigning?

Perfect

can I have countersigned?
can you have countersigned?
can he have countersigned?
can we have countersigned?
can you have countersigned?
can they have countersigned?

V-ing perfect

can I have been countersigning?
can you have been countersigning?
can he have been countersigning?
can we have been countersigning?
can you have been countersigning?
can they have been countersigning?

Interro-negative form

Simple form

can't I countersign?
can't you countersign?
can't he countersign?
can't we countersign?
can't you countersign?
can't they countersign?

V-ing form

can't I be countersigning?
can't you be countersigning?
can't he be countersigning?
can't we be countersigning?
can't you be countersigning?
can't they be countersigning?

Perfect

can't I have countersigned?
can't you have countersigned?
can't he have countersigned?
can't we have countersigned?
can't you have countersigned?
can't they have countersigned?

V-ing perfect

can't I have been countersigning?
can't you have been countersigning?
can't he have been countersigning?
can't we have been countersigning?
can't you have been countersigning?
can't they have been countersigning?

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