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 must not fishtail you must not fishtail he must not fishtail we must not fishtail you must not fishtail they must not fishtail	I must not be fishtailing you must not be fishtailing he must not be fishtailing we must not be fishtailing you must not be fishtailing they must not be fishtailing
Perfect	V-ing perfect
I must not have fishtailed you must not have fishtailed he must not have fishtailed we must not have fishtailed you must not have fishtailed they must not have fishtailed	I must not have been fishtailing you must not have been fishtailing he must not have been fishtailing we must not have been fishtailing you must not have been fishtailing they must not 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
must I not fishtail? must you not fishtail? must he not fishtail? must we not fishtail? must you not fishtail? must they not fishtail?	must I not be fishtailing? must you not be fishtailing? must he not be fishtailing? must we not be fishtailing? must you not be fishtailing? must they not be fishtailing?
Perfect	V-ing perfect
must I not have fishtailed? must you not have fishtailed? must he not have fishtailed? must we not have fishtailed? must you not have fishtailed? must they not have fishtailed?	must I not have been fishtailing? must you not have been fishtailing? must he not have been fishtailing? must we not have been fishtailing? must you not have been fishtailing? must they not have been fishtailing?