English verb conjugation
COULD SCUBA

Regular verb: scuba - scubaed - scubaed

Affirmation

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

Negation

Simple form	V-ing form
I could not scuba you could not scuba he could not scuba we could not scuba you could not scuba they could not scuba	I could not be scubaing you could not be scubaing he could not be scubaing we could not be scubaing you could not be scubaing they could not be scubaing
Perfect	V-ing perfect
I could not have scubaed you could not have scubaed he could not have scubaed we could not have scubaed you could not have scubaed they could not have scubaed	I could not have been scubaing you could not have been scubaing he could not have been scubaing we could not have been scubaing you could not have been scubaing they could not have been scubaing

Interrogative form

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

Interro-negative form

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