English verb conjugation
COULD BLANK

Regular verb: blank - blanked - blanked

Affirmation

Simple form	V-ing form
I could blank you could blank he could blank we could blank you could blank they could blank	I could be blanking you could be blanking he could be blanking we could be blanking you could be blanking they could be blanking
Perfect	V-ing perfect
I could have blanked you could have blanked he could have blanked we could have blanked you could have blanked they could have blanked	I could have been blanking you could have been blanking he could have been blanking we could have been blanking you could have been blanking they could have been blanking

Negation

Simple form	V-ing form
I couldn't blank you couldn't blank he couldn't blank we couldn't blank you couldn't blank they couldn't blank	I couldn't be blanking you couldn't be blanking he couldn't be blanking we couldn't be blanking you couldn't be blanking they couldn't be blanking
Perfect	V-ing perfect
I couldn't have blanked you couldn't have blanked he couldn't have blanked we couldn't have blanked you couldn't have blanked they couldn't have blanked	I couldn't have been blanking you couldn't have been blanking he couldn't have been blanking we couldn't have been blanking you couldn't have been blanking they couldn't have been blanking

Interrogative form

Simple form	V-ing form
could I blank? could you blank? could he blank? could we blank? could you blank? could they blank?	could I be blanking? could you be blanking? could he be blanking? could we be blanking? could you be blanking? could they be blanking?
Perfect	V-ing perfect
could I have blanked? could you have blanked? could he have blanked? could we have blanked? could you have blanked? could they have blanked?	could I have been blanking? could you have been blanking? could he have been blanking? could we have been blanking? could you have been blanking? could they have been blanking?

Interro-negative form

Simple form	V-ing form
couldn't I blank? couldn't you blank? couldn't he blank? couldn't we blank? couldn't you blank? couldn't they blank?	couldn't I be blanking? couldn't you be blanking? couldn't he be blanking? couldn't we be blanking? couldn't you be blanking? couldn't they be blanking?
Perfect	V-ing perfect
couldn't I have blanked? couldn't you have blanked? couldn't he have blanked? couldn't we have blanked? couldn't you have blanked? couldn't they have blanked?	couldn't I have been blanking? couldn't you have been blanking? couldn't he have been blanking? couldn't we have been blanking? couldn't you have been blanking? couldn't they have been blanking?