English verb conjugation
COULD GIGGLE

Regular verb: giggle - giggled - giggled

Affirmation

Simple form	V-ing form
I could giggle you could giggle he could giggle we could giggle you could giggle they could giggle	I could be giggling you could be giggling he could be giggling we could be giggling you could be giggling they could be giggling
Perfect	V-ing perfect
I could have giggled you could have giggled he could have giggled we could have giggled you could have giggled they could have giggled	I could have been giggling you could have been giggling he could have been giggling we could have been giggling you could have been giggling they could have been giggling

Negation

Simple form	V-ing form
I could not giggle you could not giggle he could not giggle we could not giggle you could not giggle they could not giggle	I could not be giggling you could not be giggling he could not be giggling we could not be giggling you could not be giggling they could not be giggling
Perfect	V-ing perfect
I could not have giggled you could not have giggled he could not have giggled we could not have giggled you could not have giggled they could not have giggled	I could not have been giggling you could not have been giggling he could not have been giggling we could not have been giggling you could not have been giggling they could not have been giggling

Interrogative form

Simple form	V-ing form
could I giggle? could you giggle? could he giggle? could we giggle? could you giggle? could they giggle?	could I be giggling? could you be giggling? could he be giggling? could we be giggling? could you be giggling? could they be giggling?
Perfect	V-ing perfect
could I have giggled? could you have giggled? could he have giggled? could we have giggled? could you have giggled? could they have giggled?	could I have been giggling? could you have been giggling? could he have been giggling? could we have been giggling? could you have been giggling? could they have been giggling?

Interro-negative form

Simple form	V-ing form
could I not giggle? could you not giggle? could he not giggle? could we not giggle? could you not giggle? could they not giggle?	could I not be giggling? could you not be giggling? could he not be giggling? could we not be giggling? could you not be giggling? could they not be giggling?
Perfect	V-ing perfect
could I not have giggled? could you not have giggled? could he not have giggled? could we not have giggled? could you not have giggled? could they not have giggled?	could I not have been giggling? could you not have been giggling? could he not have been giggling? could we not have been giggling? could you not have been giggling? could they not have been giggling?