English verb conjugation
COULD SOUND

Regular verb: sound - sounded - sounded

Affirmation

Simple form	V-ing form
I could sound you could sound he could sound we could sound you could sound they could sound	I could be sounding you could be sounding he could be sounding we could be sounding you could be sounding they could be sounding
Perfect	V-ing perfect
I could have sounded you could have sounded he could have sounded we could have sounded you could have sounded they could have sounded	I could have been sounding you could have been sounding he could have been sounding we could have been sounding you could have been sounding they could have been sounding

Negation

Simple form	V-ing form
I couldn't sound you couldn't sound he couldn't sound we couldn't sound you couldn't sound they couldn't sound	I couldn't be sounding you couldn't be sounding he couldn't be sounding we couldn't be sounding you couldn't be sounding they couldn't be sounding
Perfect	V-ing perfect
I couldn't have sounded you couldn't have sounded he couldn't have sounded we couldn't have sounded you couldn't have sounded they couldn't have sounded	I couldn't have been sounding you couldn't have been sounding he couldn't have been sounding we couldn't have been sounding you couldn't have been sounding they couldn't have been sounding

Interrogative form

Simple form	V-ing form
could I sound? could you sound? could he sound? could we sound? could you sound? could they sound?	could I be sounding? could you be sounding? could he be sounding? could we be sounding? could you be sounding? could they be sounding?
Perfect	V-ing perfect
could I have sounded? could you have sounded? could he have sounded? could we have sounded? could you have sounded? could they have sounded?	could I have been sounding? could you have been sounding? could he have been sounding? could we have been sounding? could you have been sounding? could they have been sounding?

Interro-negative form

Simple form	V-ing form
couldn't I sound? couldn't you sound? couldn't he sound? couldn't we sound? couldn't you sound? couldn't they sound?	couldn't I be sounding? couldn't you be sounding? couldn't he be sounding? couldn't we be sounding? couldn't you be sounding? couldn't they be sounding?
Perfect	V-ing perfect
couldn't I have sounded? couldn't you have sounded? couldn't he have sounded? couldn't we have sounded? couldn't you have sounded? couldn't they have sounded?	couldn't I have been sounding? couldn't you have been sounding? couldn't he have been sounding? couldn't we have been sounding? couldn't you have been sounding? couldn't they have been sounding?