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 couldn't giggle you couldn't giggle he couldn't giggle we couldn't giggle you couldn't giggle they couldn't giggle	I couldn't be giggling you couldn't be giggling he couldn't be giggling we couldn't be giggling you couldn't be giggling they couldn't be giggling
Perfect	V-ing perfect
I couldn't have giggled you couldn't have giggled he couldn't have giggled we couldn't have giggled you couldn't have giggled they couldn't have giggled	I couldn't have been giggling you couldn't have been giggling he couldn't have been giggling we couldn't have been giggling you couldn't have been giggling they couldn't 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
couldn't I giggle? couldn't you giggle? couldn't he giggle? couldn't we giggle? couldn't you giggle? couldn't they giggle?	couldn't I be giggling? couldn't you be giggling? couldn't he be giggling? couldn't we be giggling? couldn't you be giggling? couldn't they be giggling?
Perfect	V-ing perfect
couldn't I have giggled? couldn't you have giggled? couldn't he have giggled? couldn't we have giggled? couldn't you have giggled? couldn't they have giggled?	couldn't I have been giggling? couldn't you have been giggling? couldn't he have been giggling? couldn't we have been giggling? couldn't you have been giggling? couldn't they have been giggling?