English verb conjugation
COULD YUCK

Regular verb: yuck - yucked - yucked

Affirmation

Simple form	V-ing form
I could yuck you could yuck she could yuck we could yuck you could yuck they could yuck	I could be yucking you could be yucking she could be yucking we could be yucking you could be yucking they could be yucking
Perfect	V-ing perfect
I could have yucked you could have yucked she could have yucked we could have yucked you could have yucked they could have yucked	I could have been yucking you could have been yucking she could have been yucking we could have been yucking you could have been yucking they could have been yucking

Negation

Simple form	V-ing form
I couldn't yuck you couldn't yuck she couldn't yuck we couldn't yuck you couldn't yuck they couldn't yuck	I couldn't be yucking you couldn't be yucking she couldn't be yucking we couldn't be yucking you couldn't be yucking they couldn't be yucking
Perfect	V-ing perfect
I couldn't have yucked you couldn't have yucked she couldn't have yucked we couldn't have yucked you couldn't have yucked they couldn't have yucked	I couldn't have been yucking you couldn't have been yucking she couldn't have been yucking we couldn't have been yucking you couldn't have been yucking they couldn't have been yucking

Interrogative form

Simple form	V-ing form
could I yuck? could you yuck? could she yuck? could we yuck? could you yuck? could they yuck?	could I be yucking? could you be yucking? could she be yucking? could we be yucking? could you be yucking? could they be yucking?
Perfect	V-ing perfect
could I have yucked? could you have yucked? could she have yucked? could we have yucked? could you have yucked? could they have yucked?	could I have been yucking? could you have been yucking? could she have been yucking? could we have been yucking? could you have been yucking? could they have been yucking?

Interro-negative form

Simple form	V-ing form
couldn't I yuck? couldn't you yuck? couldn't she yuck? couldn't we yuck? couldn't you yuck? couldn't they yuck?	couldn't I be yucking? couldn't you be yucking? couldn't she be yucking? couldn't we be yucking? couldn't you be yucking? couldn't they be yucking?
Perfect	V-ing perfect
couldn't I have yucked? couldn't you have yucked? couldn't she have yucked? couldn't we have yucked? couldn't you have yucked? couldn't they have yucked?	couldn't I have been yucking? couldn't you have been yucking? couldn't she have been yucking? couldn't we have been yucking? couldn't you have been yucking? couldn't they have been yucking?