English verb conjugation COULD GRUB

Regular verb: grub - grubbed - grubbed

Affirmation

Simple form

I could grub
you could grub
he could grub
we could grub
you could grub
they could grub

V-ing form

I could be grubbing
you could be grubbing
he could be grubbing
we could be grubbing
you could be grubbing
they could be grubbing

Perfect

I could have grubbed
you could have grubbed
he could have grubbed
we could have grubbed
you could have grubbed
they could have grubbed

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I grub?
could you grub?
could he grub?
could we grub?
could you grub?
could they grub?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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