English verb conjugation
COULD PATTERN

Regular verb: pattern - patterned - patterned

Affirmation

Simple form	V-ing form
I could pattern you could pattern she could pattern we could pattern you could pattern they could pattern	I could be patterning you could be patterning she could be patterning we could be patterning you could be patterning they could be patterning
Perfect	V-ing perfect
I could have patterned you could have patterned she could have patterned we could have patterned you could have patterned they could have patterned	I could have been patterning you could have been patterning she could have been patterning we could have been patterning you could have been patterning they could have been patterning

Negation

Simple form	V-ing form
I couldn't pattern you couldn't pattern she couldn't pattern we couldn't pattern you couldn't pattern they couldn't pattern	I couldn't be patterning you couldn't be patterning she couldn't be patterning we couldn't be patterning you couldn't be patterning they couldn't be patterning
Perfect	V-ing perfect
I couldn't have patterned you couldn't have patterned she couldn't have patterned we couldn't have patterned you couldn't have patterned they couldn't have patterned	I couldn't have been patterning you couldn't have been patterning she couldn't have been patterning we couldn't have been patterning you couldn't have been patterning they couldn't have been patterning

Interrogative form

Simple form	V-ing form
could I pattern? could you pattern? could she pattern? could we pattern? could you pattern? could they pattern?	could I be patterning? could you be patterning? could she be patterning? could we be patterning? could you be patterning? could they be patterning?
Perfect	V-ing perfect
could I have patterned? could you have patterned? could she have patterned? could we have patterned? could you have patterned? could they have patterned?	could I have been patterning? could you have been patterning? could she have been patterning? could we have been patterning? could you have been patterning? could they have been patterning?

Interro-negative form

Simple form	V-ing form
couldn't I pattern? couldn't you pattern? couldn't she pattern? couldn't we pattern? couldn't you pattern? couldn't they pattern?	couldn't I be patterning? couldn't you be patterning? couldn't she be patterning? couldn't we be patterning? couldn't you be patterning? couldn't they be patterning?
Perfect	V-ing perfect
couldn't I have patterned? couldn't you have patterned? couldn't she have patterned? couldn't we have patterned? couldn't you have patterned? couldn't they have patterned?	couldn't I have been patterning? couldn't you have been patterning? couldn't she have been patterning? couldn't we have been patterning? couldn't you have been patterning? couldn't they have been patterning?