English verb conjugation
COULD TUNE

Regular verb: tune - tuned - tuned

Affirmation

Simple form	V-ing form
I could tune you could tune she could tune we could tune you could tune they could tune	I could be tuning you could be tuning she could be tuning we could be tuning you could be tuning they could be tuning
Perfect	V-ing perfect
I could have tuned you could have tuned she could have tuned we could have tuned you could have tuned they could have tuned	I could have been tuning you could have been tuning she could have been tuning we could have been tuning you could have been tuning they could have been tuning

Negation

Simple form	V-ing form
I couldn't tune you couldn't tune she couldn't tune we couldn't tune you couldn't tune they couldn't tune	I couldn't be tuning you couldn't be tuning she couldn't be tuning we couldn't be tuning you couldn't be tuning they couldn't be tuning
Perfect	V-ing perfect
I couldn't have tuned you couldn't have tuned she couldn't have tuned we couldn't have tuned you couldn't have tuned they couldn't have tuned	I couldn't have been tuning you couldn't have been tuning she couldn't have been tuning we couldn't have been tuning you couldn't have been tuning they couldn't have been tuning

Interrogative form

Simple form	V-ing form
could I tune? could you tune? could she tune? could we tune? could you tune? could they tune?	could I be tuning? could you be tuning? could she be tuning? could we be tuning? could you be tuning? could they be tuning?
Perfect	V-ing perfect
could I have tuned? could you have tuned? could she have tuned? could we have tuned? could you have tuned? could they have tuned?	could I have been tuning? could you have been tuning? could she have been tuning? could we have been tuning? could you have been tuning? could they have been tuning?

Interro-negative form

Simple form	V-ing form
couldn't I tune? couldn't you tune? couldn't she tune? couldn't we tune? couldn't you tune? couldn't they tune?	couldn't I be tuning? couldn't you be tuning? couldn't she be tuning? couldn't we be tuning? couldn't you be tuning? couldn't they be tuning?
Perfect	V-ing perfect
couldn't I have tuned? couldn't you have tuned? couldn't she have tuned? couldn't we have tuned? couldn't you have tuned? couldn't they have tuned?	couldn't I have been tuning? couldn't you have been tuning? couldn't she have been tuning? couldn't we have been tuning? couldn't you have been tuning? couldn't they have been tuning?