English verb conjugation
COULD TICKLE

Regular verb: tickle - tickled - tickled

Affirmation

Simple form	V-ing form
I could tickle you could tickle she could tickle we could tickle you could tickle they could tickle	I could be tickling you could be tickling she could be tickling we could be tickling you could be tickling they could be tickling
Perfect	V-ing perfect
I could have tickled you could have tickled she could have tickled we could have tickled you could have tickled they could have tickled	I could have been tickling you could have been tickling she could have been tickling we could have been tickling you could have been tickling they could have been tickling

Negation

Simple form	V-ing form
I could not tickle you could not tickle she could not tickle we could not tickle you could not tickle they could not tickle	I could not be tickling you could not be tickling she could not be tickling we could not be tickling you could not be tickling they could not be tickling
Perfect	V-ing perfect
I could not have tickled you could not have tickled she could not have tickled we could not have tickled you could not have tickled they could not have tickled	I could not have been tickling you could not have been tickling she could not have been tickling we could not have been tickling you could not have been tickling they could not have been tickling

Interrogative form

Simple form	V-ing form
could I tickle? could you tickle? could she tickle? could we tickle? could you tickle? could they tickle?	could I be tickling? could you be tickling? could she be tickling? could we be tickling? could you be tickling? could they be tickling?
Perfect	V-ing perfect
could I have tickled? could you have tickled? could she have tickled? could we have tickled? could you have tickled? could they have tickled?	could I have been tickling? could you have been tickling? could she have been tickling? could we have been tickling? could you have been tickling? could they have been tickling?

Interro-negative form

Simple form	V-ing form
could I not tickle? could you not tickle? could she not tickle? could we not tickle? could you not tickle? could they not tickle?	could I not be tickling? could you not be tickling? could she not be tickling? could we not be tickling? could you not be tickling? could they not be tickling?
Perfect	V-ing perfect
could I not have tickled? could you not have tickled? could she not have tickled? could we not have tickled? could you not have tickled? could they not have tickled?	could I not have been tickling? could you not have been tickling? could she not have been tickling? could we not have been tickling? could you not have been tickling? could they not have been tickling?