English verb conjugation
COULD INCUBATE

Regular verb: incubate - incubated - incubated

Affirmation

Simple form	V-ing form
I could incubate you could incubate he could incubate we could incubate you could incubate they could incubate	I could be incubating you could be incubating he could be incubating we could be incubating you could be incubating they could be incubating
Perfect	V-ing perfect
I could have incubated you could have incubated he could have incubated we could have incubated you could have incubated they could have incubated	I could have been incubating you could have been incubating he could have been incubating we could have been incubating you could have been incubating they could have been incubating

Negation

Simple form	V-ing form
I couldn't incubate you couldn't incubate he couldn't incubate we couldn't incubate you couldn't incubate they couldn't incubate	I couldn't be incubating you couldn't be incubating he couldn't be incubating we couldn't be incubating you couldn't be incubating they couldn't be incubating
Perfect	V-ing perfect
I couldn't have incubated you couldn't have incubated he couldn't have incubated we couldn't have incubated you couldn't have incubated they couldn't have incubated	I couldn't have been incubating you couldn't have been incubating he couldn't have been incubating we couldn't have been incubating you couldn't have been incubating they couldn't have been incubating

Interrogative form

Simple form	V-ing form
could I incubate? could you incubate? could he incubate? could we incubate? could you incubate? could they incubate?	could I be incubating? could you be incubating? could he be incubating? could we be incubating? could you be incubating? could they be incubating?
Perfect	V-ing perfect
could I have incubated? could you have incubated? could he have incubated? could we have incubated? could you have incubated? could they have incubated?	could I have been incubating? could you have been incubating? could he have been incubating? could we have been incubating? could you have been incubating? could they have been incubating?

Interro-negative form

Simple form	V-ing form
couldn't I incubate? couldn't you incubate? couldn't he incubate? couldn't we incubate? couldn't you incubate? couldn't they incubate?	couldn't I be incubating? couldn't you be incubating? couldn't he be incubating? couldn't we be incubating? couldn't you be incubating? couldn't they be incubating?
Perfect	V-ing perfect
couldn't I have incubated? couldn't you have incubated? couldn't he have incubated? couldn't we have incubated? couldn't you have incubated? couldn't they have incubated?	couldn't I have been incubating? couldn't you have been incubating? couldn't he have been incubating? couldn't we have been incubating? couldn't you have been incubating? couldn't they have been incubating?