English verb conjugation CAN BACK

Regular verb: back - backed - backed

Affirmation

Simple form

I can back
you can back
he can back
we can back
you can back
they can back

V-ing form

I can be backing
you can be backing
he can be backing
we can be backing
you can be backing
they can be backing

Perfect

I can have backed
you can have backed
he can have backed
we can have backed
you can have backed
they can have backed

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

can I back?
can you back?
can he back?
can we back?
can you back?
can they back?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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