English verb conjugation
MUST SCOWL

Regular verb: scowl - scowled - scowled

Affirmation

Simple form	V-ing form
I must scowl you must scowl he must scowl we must scowl you must scowl they must scowl	I must be scowling you must be scowling he must be scowling we must be scowling you must be scowling they must be scowling
Perfect	V-ing perfect
I must have scowled you must have scowled he must have scowled we must have scowled you must have scowled they must have scowled	I must have been scowling you must have been scowling he must have been scowling we must have been scowling you must have been scowling they must have been scowling

Negation

Simple form	V-ing form
I mustn't scowl you mustn't scowl he mustn't scowl we mustn't scowl you mustn't scowl they mustn't scowl	I mustn't be scowling you mustn't be scowling he mustn't be scowling we mustn't be scowling you mustn't be scowling they mustn't be scowling
Perfect	V-ing perfect
I mustn't have scowled you mustn't have scowled he mustn't have scowled we mustn't have scowled you mustn't have scowled they mustn't have scowled	I mustn't have been scowling you mustn't have been scowling he mustn't have been scowling we mustn't have been scowling you mustn't have been scowling they mustn't have been scowling

Interrogative form

Simple form	V-ing form
must I scowl? must you scowl? must he scowl? must we scowl? must you scowl? must they scowl?	must I be scowling? must you be scowling? must he be scowling? must we be scowling? must you be scowling? must they be scowling?
Perfect	V-ing perfect
must I have scowled? must you have scowled? must he have scowled? must we have scowled? must you have scowled? must they have scowled?	must I have been scowling? must you have been scowling? must he have been scowling? must we have been scowling? must you have been scowling? must they have been scowling?

Interro-negative form

Simple form	V-ing form
mustn't I scowl? mustn't you scowl? mustn't he scowl? mustn't we scowl? mustn't you scowl? mustn't they scowl?	mustn't I be scowling? mustn't you be scowling? mustn't he be scowling? mustn't we be scowling? mustn't you be scowling? mustn't they be scowling?
Perfect	V-ing perfect
mustn't I have scowled? mustn't you have scowled? mustn't he have scowled? mustn't we have scowled? mustn't you have scowled? mustn't they have scowled?	mustn't I have been scowling? mustn't you have been scowling? mustn't he have been scowling? mustn't we have been scowling? mustn't you have been scowling? mustn't they have been scowling?