English verb conjugation
COULD TISSUE

Regular verb: tissue - tissued - tissued

Affirmation

Simple form	V-ing form
I could tissue you could tissue he could tissue we could tissue you could tissue they could tissue	I could be tissuing you could be tissuing he could be tissuing we could be tissuing you could be tissuing they could be tissuing
Perfect	V-ing perfect
I could have tissued you could have tissued he could have tissued we could have tissued you could have tissued they could have tissued	I could have been tissuing you could have been tissuing he could have been tissuing we could have been tissuing you could have been tissuing they could have been tissuing

Negation

Simple form	V-ing form
I could not tissue you could not tissue he could not tissue we could not tissue you could not tissue they could not tissue	I could not be tissuing you could not be tissuing he could not be tissuing we could not be tissuing you could not be tissuing they could not be tissuing
Perfect	V-ing perfect
I could not have tissued you could not have tissued he could not have tissued we could not have tissued you could not have tissued they could not have tissued	I could not have been tissuing you could not have been tissuing he could not have been tissuing we could not have been tissuing you could not have been tissuing they could not have been tissuing

Interrogative form

Simple form	V-ing form
could I tissue? could you tissue? could he tissue? could we tissue? could you tissue? could they tissue?	could I be tissuing? could you be tissuing? could he be tissuing? could we be tissuing? could you be tissuing? could they be tissuing?
Perfect	V-ing perfect
could I have tissued? could you have tissued? could he have tissued? could we have tissued? could you have tissued? could they have tissued?	could I have been tissuing? could you have been tissuing? could he have been tissuing? could we have been tissuing? could you have been tissuing? could they have been tissuing?

Interro-negative form

Simple form	V-ing form
could I not tissue? could you not tissue? could he not tissue? could we not tissue? could you not tissue? could they not tissue?	could I not be tissuing? could you not be tissuing? could he not be tissuing? could we not be tissuing? could you not be tissuing? could they not be tissuing?
Perfect	V-ing perfect
could I not have tissued? could you not have tissued? could he not have tissued? could we not have tissued? could you not have tissued? could they not have tissued?	could I not have been tissuing? could you not have been tissuing? could he not have been tissuing? could we not have been tissuing? could you not have been tissuing? could they not have been tissuing?