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 could not yuck you could not yuck he could not yuck we could not yuck you could not yuck they could not yuck	I could not be yucking you could not be yucking he could not be yucking we could not be yucking you could not be yucking they could not be yucking
Perfect	V-ing perfect
I could not have yucked you could not have yucked he could not have yucked we could not have yucked you could not have yucked they could not have yucked	I could not have been yucking you could not have been yucking he could not have been yucking we could not have been yucking you could not have been yucking they could not 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
could I not yuck? could you not yuck? could he not yuck? could we not yuck? could you not yuck? could they not yuck?	could I not be yucking? could you not be yucking? could he not be yucking? could we not be yucking? could you not be yucking? could they not be yucking?
Perfect	V-ing perfect
could I not have yucked? could you not have yucked? could he not have yucked? could we not have yucked? could you not have yucked? could they not have yucked?	could I not have been yucking? could you not have been yucking? could he not have been yucking? could we not have been yucking? could you not have been yucking? could they not have been yucking?