English verb conjugation
COULD TUNE

Regular verb: tune - tuned - tuned

Affirmation

Simple form	V-ing form
I could tune you could tune he could tune we could tune you could tune they could tune	I could be tuning you could be tuning he 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 he 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 he 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 he 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 he 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 he 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 he 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 he tune? could we tune? could you tune? could they tune?	could I be tuning? could you be tuning? could he 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 he 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 he 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 he 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 he 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 he 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 he have been tuning? couldn't we have been tuning? couldn't you have been tuning? couldn't they have been tuning?