English verb conjugation
COULD YUCK

Regular verb: yuck - yucked - yucked

Affirmation

Simple form	V-ing form
I could yuck you could yuck he could yuck we could yuck you could yuck they could yuck	I could be yucking you could be yucking he 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 he 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 he 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 he 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 he 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 he 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 he 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 he yuck? could we yuck? could you yuck? could they yuck?	could I be yucking? could you be yucking? could he 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 he 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 he 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 he 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 he 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 he 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 he have been yucking? couldn't we have been yucking? couldn't you have been yucking? couldn't they have been yucking?