English verb conjugation
COULD THROW

Irregular verb: throw - threw - thrown

Affirmation

Simple form	V-ing form
I could throw you could throw he could throw we could throw you could throw they could throw	I could be throwing you could be throwing he could be throwing we could be throwing you could be throwing they could be throwing
Perfect	V-ing perfect
I could have thrown you could have thrown he could have thrown we could have thrown you could have thrown they could have thrown	I could have been throwing you could have been throwing he could have been throwing we could have been throwing you could have been throwing they could have been throwing

Negation

Simple form	V-ing form
I couldn't throw you couldn't throw he couldn't throw we couldn't throw you couldn't throw they couldn't throw	I couldn't be throwing you couldn't be throwing he couldn't be throwing we couldn't be throwing you couldn't be throwing they couldn't be throwing
Perfect	V-ing perfect
I couldn't have thrown you couldn't have thrown he couldn't have thrown we couldn't have thrown you couldn't have thrown they couldn't have thrown	I couldn't have been throwing you couldn't have been throwing he couldn't have been throwing we couldn't have been throwing you couldn't have been throwing they couldn't have been throwing

Interrogative form

Simple form	V-ing form
could I throw? could you throw? could he throw? could we throw? could you throw? could they throw?	could I be throwing? could you be throwing? could he be throwing? could we be throwing? could you be throwing? could they be throwing?
Perfect	V-ing perfect
could I have thrown? could you have thrown? could he have thrown? could we have thrown? could you have thrown? could they have thrown?	could I have been throwing? could you have been throwing? could he have been throwing? could we have been throwing? could you have been throwing? could they have been throwing?

Interro-negative form

Simple form	V-ing form
couldn't I throw? couldn't you throw? couldn't he throw? couldn't we throw? couldn't you throw? couldn't they throw?	couldn't I be throwing? couldn't you be throwing? couldn't he be throwing? couldn't we be throwing? couldn't you be throwing? couldn't they be throwing?
Perfect	V-ing perfect
couldn't I have thrown? couldn't you have thrown? couldn't he have thrown? couldn't we have thrown? couldn't you have thrown? couldn't they have thrown?	couldn't I have been throwing? couldn't you have been throwing? couldn't he have been throwing? couldn't we have been throwing? couldn't you have been throwing? couldn't they have been throwing?