English verb conjugation
COULD INTERCALATE

Regular verb: intercalate - intercalated - intercalated

Affirmation

Simple form	V-ing form
I could intercalate you could intercalate he could intercalate we could intercalate you could intercalate they could intercalate	I could be intercalating you could be intercalating he could be intercalating we could be intercalating you could be intercalating they could be intercalating
Perfect	V-ing perfect
I could have intercalated you could have intercalated he could have intercalated we could have intercalated you could have intercalated they could have intercalated	I could have been intercalating you could have been intercalating he could have been intercalating we could have been intercalating you could have been intercalating they could have been intercalating

Negation

Simple form	V-ing form
I couldn't intercalate you couldn't intercalate he couldn't intercalate we couldn't intercalate you couldn't intercalate they couldn't intercalate	I couldn't be intercalating you couldn't be intercalating he couldn't be intercalating we couldn't be intercalating you couldn't be intercalating they couldn't be intercalating
Perfect	V-ing perfect
I couldn't have intercalated you couldn't have intercalated he couldn't have intercalated we couldn't have intercalated you couldn't have intercalated they couldn't have intercalated	I couldn't have been intercalating you couldn't have been intercalating he couldn't have been intercalating we couldn't have been intercalating you couldn't have been intercalating they couldn't have been intercalating

Interrogative form

Simple form	V-ing form
could I intercalate? could you intercalate? could he intercalate? could we intercalate? could you intercalate? could they intercalate?	could I be intercalating? could you be intercalating? could he be intercalating? could we be intercalating? could you be intercalating? could they be intercalating?
Perfect	V-ing perfect
could I have intercalated? could you have intercalated? could he have intercalated? could we have intercalated? could you have intercalated? could they have intercalated?	could I have been intercalating? could you have been intercalating? could he have been intercalating? could we have been intercalating? could you have been intercalating? could they have been intercalating?

Interro-negative form

Simple form	V-ing form
couldn't I intercalate? couldn't you intercalate? couldn't he intercalate? couldn't we intercalate? couldn't you intercalate? couldn't they intercalate?	couldn't I be intercalating? couldn't you be intercalating? couldn't he be intercalating? couldn't we be intercalating? couldn't you be intercalating? couldn't they be intercalating?
Perfect	V-ing perfect
couldn't I have intercalated? couldn't you have intercalated? couldn't he have intercalated? couldn't we have intercalated? couldn't you have intercalated? couldn't they have intercalated?	couldn't I have been intercalating? couldn't you have been intercalating? couldn't he have been intercalating? couldn't we have been intercalating? couldn't you have been intercalating? couldn't they have been intercalating?