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 couldn't catechize you couldn't catechize she couldn't catechize we couldn't catechize you couldn't catechize they couldn't catechize
V-ing form
I couldn't be catechizing you couldn't be catechizing she couldn't be catechizing we couldn't be catechizing you couldn't be catechizing they couldn't be catechizing
Perfect
I couldn't have catechized you couldn't have catechized she couldn't have catechized we couldn't have catechized you couldn't have catechized they couldn't have catechized
V-ing perfect
I couldn't have been catechizing you couldn't have been catechizing she couldn't have been catechizing we couldn't have been catechizing you couldn't have been catechizing they couldn't 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
couldn't I catechize? couldn't you catechize? couldn't she catechize? couldn't we catechize? couldn't you catechize? couldn't they catechize?
V-ing form
couldn't I be catechizing? couldn't you be catechizing? couldn't she be catechizing? couldn't we be catechizing? couldn't you be catechizing? couldn't they be catechizing?
Perfect
couldn't I have catechized? couldn't you have catechized? couldn't she have catechized? couldn't we have catechized? couldn't you have catechized? couldn't they have catechized?
V-ing perfect
couldn't I have been catechizing? couldn't you have been catechizing? couldn't she have been catechizing? couldn't we have been catechizing? couldn't you have been catechizing? couldn't they have been catechizing?