I could catechize you could catechize she could catechize we could catechize you could catechize they could catechize
V-ing form
I could be catechizing you could be catechizing she could be catechizing we could be catechizing you could be catechizing they could be catechizing
Perfect
I could have catechized you could have catechized she could have catechized we could have catechized you could have catechized they could have catechized
V-ing perfect
I could have been catechizing you could have been catechizing she could have been catechizing we could have been catechizing you could have been catechizing they could have been catechizing
Negation
Simple form
I could not catechize you could not catechize she could not catechize we could not catechize you could not catechize they could not catechize
V-ing form
I could not be catechizing you could not be catechizing she could not be catechizing we could not be catechizing you could not be catechizing they could not be catechizing
Perfect
I could not have catechized you could not have catechized she could not have catechized we could not have catechized you could not have catechized they could not have catechized
V-ing perfect
I could not have been catechizing you could not have been catechizing she could not have been catechizing we could not have been catechizing you could not have been catechizing they could not have been catechizing
Interrogative form
Simple form
could I catechize? could you catechize? could she catechize? could we catechize? could you catechize? could they catechize?
V-ing form
could I be catechizing? could you be catechizing? could she be catechizing? could we be catechizing? could you be catechizing? could they be catechizing?
Perfect
could I have catechized? could you have catechized? could she have catechized? could we have catechized? could you have catechized? could they have catechized?
V-ing perfect
could I have been catechizing? could you have been catechizing? could she have been catechizing? could we have been catechizing? could you have been catechizing? could they have been catechizing?
Interro-negative form
Simple form
could I not catechize? could you not catechize? could she not catechize? could we not catechize? could you not catechize? could they not catechize?
V-ing form
could I not be catechizing? could you not be catechizing? could she not be catechizing? could we not be catechizing? could you not be catechizing? could they not be catechizing?
Perfect
could I not have catechized? could you not have catechized? could she not have catechized? could we not have catechized? could you not have catechized? could they not have catechized?
V-ing perfect
could I not have been catechizing? could you not have been catechizing? could she not have been catechizing? could we not have been catechizing? could you not have been catechizing? could they not have been catechizing?