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