English verb conjugation
COULD SINGLE-SPACE

Regular verb: single-space - single-spaced - single-spaced

Affirmation

Simple form	V-ing form
I could single-space you could single-space he could single-space we could single-space you could single-space they could single-space	I could be single-spacing you could be single-spacing he could be single-spacing we could be single-spacing you could be single-spacing they could be single-spacing
Perfect	V-ing perfect
I could have single-spaced you could have single-spaced he could have single-spaced we could have single-spaced you could have single-spaced they could have single-spaced	I could have been single-spacing you could have been single-spacing he could have been single-spacing we could have been single-spacing you could have been single-spacing they could have been single-spacing

Negation

Simple form	V-ing form
I couldn't single-space you couldn't single-space he couldn't single-space we couldn't single-space you couldn't single-space they couldn't single-space	I couldn't be single-spacing you couldn't be single-spacing he couldn't be single-spacing we couldn't be single-spacing you couldn't be single-spacing they couldn't be single-spacing
Perfect	V-ing perfect
I couldn't have single-spaced you couldn't have single-spaced he couldn't have single-spaced we couldn't have single-spaced you couldn't have single-spaced they couldn't have single-spaced	I couldn't have been single-spacing you couldn't have been single-spacing he couldn't have been single-spacing we couldn't have been single-spacing you couldn't have been single-spacing they couldn't have been single-spacing

Interrogative form

Simple form	V-ing form
could I single-space? could you single-space? could he single-space? could we single-space? could you single-space? could they single-space?	could I be single-spacing? could you be single-spacing? could he be single-spacing? could we be single-spacing? could you be single-spacing? could they be single-spacing?
Perfect	V-ing perfect
could I have single-spaced? could you have single-spaced? could he have single-spaced? could we have single-spaced? could you have single-spaced? could they have single-spaced?	could I have been single-spacing? could you have been single-spacing? could he have been single-spacing? could we have been single-spacing? could you have been single-spacing? could they have been single-spacing?

Interro-negative form

Simple form	V-ing form
couldn't I single-space? couldn't you single-space? couldn't he single-space? couldn't we single-space? couldn't you single-space? couldn't they single-space?	couldn't I be single-spacing? couldn't you be single-spacing? couldn't he be single-spacing? couldn't we be single-spacing? couldn't you be single-spacing? couldn't they be single-spacing?
Perfect	V-ing perfect
couldn't I have single-spaced? couldn't you have single-spaced? couldn't he have single-spaced? couldn't we have single-spaced? couldn't you have single-spaced? couldn't they have single-spaced?	couldn't I have been single-spacing? couldn't you have been single-spacing? couldn't he have been single-spacing? couldn't we have been single-spacing? couldn't you have been single-spacing? couldn't they have been single-spacing?