English verb conjugation
MUST SCUBA

Regular verb: scuba - scubaed - scubaed

Affirmation

Simple form	V-ing form
I must scuba you must scuba he must scuba we must scuba you must scuba they must scuba	I must be scubaing you must be scubaing he must be scubaing we must be scubaing you must be scubaing they must be scubaing
Perfect	V-ing perfect
I must have scubaed you must have scubaed he must have scubaed we must have scubaed you must have scubaed they must have scubaed	I must have been scubaing you must have been scubaing he must have been scubaing we must have been scubaing you must have been scubaing they must have been scubaing

Negation

Simple form	V-ing form
I mustn't scuba you mustn't scuba he mustn't scuba we mustn't scuba you mustn't scuba they mustn't scuba	I mustn't be scubaing you mustn't be scubaing he mustn't be scubaing we mustn't be scubaing you mustn't be scubaing they mustn't be scubaing
Perfect	V-ing perfect
I mustn't have scubaed you mustn't have scubaed he mustn't have scubaed we mustn't have scubaed you mustn't have scubaed they mustn't have scubaed	I mustn't have been scubaing you mustn't have been scubaing he mustn't have been scubaing we mustn't have been scubaing you mustn't have been scubaing they mustn't have been scubaing

Interrogative form

Simple form	V-ing form
must I scuba? must you scuba? must he scuba? must we scuba? must you scuba? must they scuba?	must I be scubaing? must you be scubaing? must he be scubaing? must we be scubaing? must you be scubaing? must they be scubaing?
Perfect	V-ing perfect
must I have scubaed? must you have scubaed? must he have scubaed? must we have scubaed? must you have scubaed? must they have scubaed?	must I have been scubaing? must you have been scubaing? must he have been scubaing? must we have been scubaing? must you have been scubaing? must they have been scubaing?

Interro-negative form

Simple form	V-ing form
mustn't I scuba? mustn't you scuba? mustn't he scuba? mustn't we scuba? mustn't you scuba? mustn't they scuba?	mustn't I be scubaing? mustn't you be scubaing? mustn't he be scubaing? mustn't we be scubaing? mustn't you be scubaing? mustn't they be scubaing?
Perfect	V-ing perfect
mustn't I have scubaed? mustn't you have scubaed? mustn't he have scubaed? mustn't we have scubaed? mustn't you have scubaed? mustn't they have scubaed?	mustn't I have been scubaing? mustn't you have been scubaing? mustn't he have been scubaing? mustn't we have been scubaing? mustn't you have been scubaing? mustn't they have been scubaing?