English verb conjugation
COULD WHIZ

Regular verb: whiz - whized - whized

Affirmation

Simple form	V-ing form
I could whiz you could whiz he could whiz we could whiz you could whiz they could whiz	I could be whizing you could be whizing he could be whizing we could be whizing you could be whizing they could be whizing
Perfect	V-ing perfect
I could have whized you could have whized he could have whized we could have whized you could have whized they could have whized	I could have been whizing you could have been whizing he could have been whizing we could have been whizing you could have been whizing they could have been whizing

Negation

Simple form	V-ing form
I couldn't whiz you couldn't whiz he couldn't whiz we couldn't whiz you couldn't whiz they couldn't whiz	I couldn't be whizing you couldn't be whizing he couldn't be whizing we couldn't be whizing you couldn't be whizing they couldn't be whizing
Perfect	V-ing perfect
I couldn't have whized you couldn't have whized he couldn't have whized we couldn't have whized you couldn't have whized they couldn't have whized	I couldn't have been whizing you couldn't have been whizing he couldn't have been whizing we couldn't have been whizing you couldn't have been whizing they couldn't have been whizing

Interrogative form

Simple form	V-ing form
could I whiz? could you whiz? could he whiz? could we whiz? could you whiz? could they whiz?	could I be whizing? could you be whizing? could he be whizing? could we be whizing? could you be whizing? could they be whizing?
Perfect	V-ing perfect
could I have whized? could you have whized? could he have whized? could we have whized? could you have whized? could they have whized?	could I have been whizing? could you have been whizing? could he have been whizing? could we have been whizing? could you have been whizing? could they have been whizing?

Interro-negative form

Simple form	V-ing form
couldn't I whiz? couldn't you whiz? couldn't he whiz? couldn't we whiz? couldn't you whiz? couldn't they whiz?	couldn't I be whizing? couldn't you be whizing? couldn't he be whizing? couldn't we be whizing? couldn't you be whizing? couldn't they be whizing?
Perfect	V-ing perfect
couldn't I have whized? couldn't you have whized? couldn't he have whized? couldn't we have whized? couldn't you have whized? couldn't they have whized?	couldn't I have been whizing? couldn't you have been whizing? couldn't he have been whizing? couldn't we have been whizing? couldn't you have been whizing? couldn't they have been whizing?