English verb conjugation
COULD AIR-CONDITION

Regular verb: air-condition - air-conditioned - air-conditioned

Affirmation

Simple form	V-ing form
I could air-condition you could air-condition she could air-condition we could air-condition you could air-condition they could air-condition	I could be air-conditioning you could be air-conditioning she could be air-conditioning we could be air-conditioning you could be air-conditioning they could be air-conditioning
Perfect	V-ing perfect
I could have air-conditioned you could have air-conditioned she could have air-conditioned we could have air-conditioned you could have air-conditioned they could have air-conditioned	I could have been air-conditioning you could have been air-conditioning she could have been air-conditioning we could have been air-conditioning you could have been air-conditioning they could have been air-conditioning

Negation

Simple form	V-ing form
I could not air-condition you could not air-condition she could not air-condition we could not air-condition you could not air-condition they could not air-condition	I could not be air-conditioning you could not be air-conditioning she could not be air-conditioning we could not be air-conditioning you could not be air-conditioning they could not be air-conditioning
Perfect	V-ing perfect
I could not have air-conditioned you could not have air-conditioned she could not have air-conditioned we could not have air-conditioned you could not have air-conditioned they could not have air-conditioned	I could not have been air-conditioning you could not have been air-conditioning she could not have been air-conditioning we could not have been air-conditioning you could not have been air-conditioning they could not have been air-conditioning

Interrogative form

Simple form	V-ing form
could I air-condition? could you air-condition? could she air-condition? could we air-condition? could you air-condition? could they air-condition?	could I be air-conditioning? could you be air-conditioning? could she be air-conditioning? could we be air-conditioning? could you be air-conditioning? could they be air-conditioning?
Perfect	V-ing perfect
could I have air-conditioned? could you have air-conditioned? could she have air-conditioned? could we have air-conditioned? could you have air-conditioned? could they have air-conditioned?	could I have been air-conditioning? could you have been air-conditioning? could she have been air-conditioning? could we have been air-conditioning? could you have been air-conditioning? could they have been air-conditioning?

Interro-negative form

Simple form	V-ing form
could I not air-condition? could you not air-condition? could she not air-condition? could we not air-condition? could you not air-condition? could they not air-condition?	could I not be air-conditioning? could you not be air-conditioning? could she not be air-conditioning? could we not be air-conditioning? could you not be air-conditioning? could they not be air-conditioning?
Perfect	V-ing perfect
could I not have air-conditioned? could you not have air-conditioned? could she not have air-conditioned? could we not have air-conditioned? could you not have air-conditioned? could they not have air-conditioned?	could I not have been air-conditioning? could you not have been air-conditioning? could she not have been air-conditioning? could we not have been air-conditioning? could you not have been air-conditioning? could they not have been air-conditioning?