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 cannot back
you cannot back
he cannot back
we cannot back
you cannot back
they cannot back

V-ing form

I cannot be backing
you cannot be backing
he cannot be backing
we cannot be backing
you cannot be backing
they cannot be backing

Perfect

I cannot have backed
you cannot have backed
he cannot have backed
we cannot have backed
you cannot have backed
they cannot have backed

V-ing perfect

I cannot have been backing
you cannot have been backing
he cannot have been backing
we cannot have been backing
you cannot have been backing
they cannot 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 I not back?
can you not back?
can he not back?
can we not back?
can you not back?
can they not back?

V-ing form

can I not be backing?
can you not be backing?
can he not be backing?
can we not be backing?
can you not be backing?
can they not be backing?

Perfect

can I not have backed?
can you not have backed?
can he not have backed?
can we not have backed?
can you not have backed?
can they not have backed?

V-ing perfect

can I not have been backing?
can you not have been backing?
can he not have been backing?
can we not have been backing?
can you not have been backing?
can they not have been backing?

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