English verb conjugation
MUST FISHTAIL

Regular verb: fishtail - fishtailed - fishtailed

Affirmation

Simple form	V-ing form
I must fishtail you must fishtail he must fishtail we must fishtail you must fishtail they must fishtail	I must be fishtailing you must be fishtailing he must be fishtailing we must be fishtailing you must be fishtailing they must be fishtailing
Perfect	V-ing perfect
I must have fishtailed you must have fishtailed he must have fishtailed we must have fishtailed you must have fishtailed they must have fishtailed	I must have been fishtailing you must have been fishtailing he must have been fishtailing we must have been fishtailing you must have been fishtailing they must have been fishtailing

Negation

Simple form	V-ing form
I mustn't fishtail you mustn't fishtail he mustn't fishtail we mustn't fishtail you mustn't fishtail they mustn't fishtail	I mustn't be fishtailing you mustn't be fishtailing he mustn't be fishtailing we mustn't be fishtailing you mustn't be fishtailing they mustn't be fishtailing
Perfect	V-ing perfect
I mustn't have fishtailed you mustn't have fishtailed he mustn't have fishtailed we mustn't have fishtailed you mustn't have fishtailed they mustn't have fishtailed	I mustn't have been fishtailing you mustn't have been fishtailing he mustn't have been fishtailing we mustn't have been fishtailing you mustn't have been fishtailing they mustn't have been fishtailing

Interrogative form

Simple form	V-ing form
must I fishtail? must you fishtail? must he fishtail? must we fishtail? must you fishtail? must they fishtail?	must I be fishtailing? must you be fishtailing? must he be fishtailing? must we be fishtailing? must you be fishtailing? must they be fishtailing?
Perfect	V-ing perfect
must I have fishtailed? must you have fishtailed? must he have fishtailed? must we have fishtailed? must you have fishtailed? must they have fishtailed?	must I have been fishtailing? must you have been fishtailing? must he have been fishtailing? must we have been fishtailing? must you have been fishtailing? must they have been fishtailing?

Interro-negative form

Simple form	V-ing form
mustn't I fishtail? mustn't you fishtail? mustn't he fishtail? mustn't we fishtail? mustn't you fishtail? mustn't they fishtail?	mustn't I be fishtailing? mustn't you be fishtailing? mustn't he be fishtailing? mustn't we be fishtailing? mustn't you be fishtailing? mustn't they be fishtailing?
Perfect	V-ing perfect
mustn't I have fishtailed? mustn't you have fishtailed? mustn't he have fishtailed? mustn't we have fishtailed? mustn't you have fishtailed? mustn't they have fishtailed?	mustn't I have been fishtailing? mustn't you have been fishtailing? mustn't he have been fishtailing? mustn't we have been fishtailing? mustn't you have been fishtailing? mustn't they have been fishtailing?