English verb conjugation COULD TOUGH

Regular verb: tough - toughed - toughed

Affirmation

Simple form

I could tough
you could tough
he could tough
we could tough
you could tough
they could tough

V-ing form

I could be toughing
you could be toughing
he could be toughing
we could be toughing
you could be toughing
they could be toughing

Perfect

I could have toughed
you could have toughed
he could have toughed
we could have toughed
you could have toughed
they could have toughed

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I tough?
could you tough?
could he tough?
could we tough?
could you tough?
could they tough?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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