English verb conjugation
MUST GIGGLE

Regular verb: giggle - giggled - giggled

Affirmation

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

Negation

Simple form	V-ing form
I mustn't giggle you mustn't giggle he mustn't giggle we mustn't giggle you mustn't giggle they mustn't giggle	I mustn't be giggling you mustn't be giggling he mustn't be giggling we mustn't be giggling you mustn't be giggling they mustn't be giggling
Perfect	V-ing perfect
I mustn't have giggled you mustn't have giggled he mustn't have giggled we mustn't have giggled you mustn't have giggled they mustn't have giggled	I mustn't have been giggling you mustn't have been giggling he mustn't have been giggling we mustn't have been giggling you mustn't have been giggling they mustn't have been giggling

Interrogative form

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

Interro-negative form

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