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 must not scuba you must not scuba he must not scuba we must not scuba you must not scuba they must not scuba	I must not be scubaing you must not be scubaing he must not be scubaing we must not be scubaing you must not be scubaing they must not be scubaing
Perfect	V-ing perfect
I must not have scubaed you must not have scubaed he must not have scubaed we must not have scubaed you must not have scubaed they must not have scubaed	I must not have been scubaing you must not have been scubaing he must not have been scubaing we must not have been scubaing you must not have been scubaing they must not 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
must I not scuba? must you not scuba? must he not scuba? must we not scuba? must you not scuba? must they not scuba?	must I not be scubaing? must you not be scubaing? must he not be scubaing? must we not be scubaing? must you not be scubaing? must they not be scubaing?
Perfect	V-ing perfect
must I not have scubaed? must you not have scubaed? must he not have scubaed? must we not have scubaed? must you not have scubaed? must they not have scubaed?	must I not have been scubaing? must you not have been scubaing? must he not have been scubaing? must we not have been scubaing? must you not have been scubaing? must they not have been scubaing?