English verb conjugation
MUST RIDDLE

Regular verb: riddle - riddled - riddled

Affirmation

Simple form	V-ing form
I must riddle you must riddle she must riddle we must riddle you must riddle they must riddle	I must be riddling you must be riddling she must be riddling we must be riddling you must be riddling they must be riddling
Perfect	V-ing perfect
I must have riddled you must have riddled she must have riddled we must have riddled you must have riddled they must have riddled	I must have been riddling you must have been riddling she must have been riddling we must have been riddling you must have been riddling they must have been riddling

Negation

Simple form	V-ing form
I mustn't riddle you mustn't riddle she mustn't riddle we mustn't riddle you mustn't riddle they mustn't riddle	I mustn't be riddling you mustn't be riddling she mustn't be riddling we mustn't be riddling you mustn't be riddling they mustn't be riddling
Perfect	V-ing perfect
I mustn't have riddled you mustn't have riddled she mustn't have riddled we mustn't have riddled you mustn't have riddled they mustn't have riddled	I mustn't have been riddling you mustn't have been riddling she mustn't have been riddling we mustn't have been riddling you mustn't have been riddling they mustn't have been riddling

Interrogative form

Simple form	V-ing form
must I riddle? must you riddle? must she riddle? must we riddle? must you riddle? must they riddle?	must I be riddling? must you be riddling? must she be riddling? must we be riddling? must you be riddling? must they be riddling?
Perfect	V-ing perfect
must I have riddled? must you have riddled? must she have riddled? must we have riddled? must you have riddled? must they have riddled?	must I have been riddling? must you have been riddling? must she have been riddling? must we have been riddling? must you have been riddling? must they have been riddling?

Interro-negative form

Simple form	V-ing form
mustn't I riddle? mustn't you riddle? mustn't she riddle? mustn't we riddle? mustn't you riddle? mustn't they riddle?	mustn't I be riddling? mustn't you be riddling? mustn't she be riddling? mustn't we be riddling? mustn't you be riddling? mustn't they be riddling?
Perfect	V-ing perfect
mustn't I have riddled? mustn't you have riddled? mustn't she have riddled? mustn't we have riddled? mustn't you have riddled? mustn't they have riddled?	mustn't I have been riddling? mustn't you have been riddling? mustn't she have been riddling? mustn't we have been riddling? mustn't you have been riddling? mustn't they have been riddling?