I could sanitize you could sanitize she could sanitize we could sanitize you could sanitize they could sanitize
V-ing form
I could be sanitizing you could be sanitizing she could be sanitizing we could be sanitizing you could be sanitizing they could be sanitizing
Perfect
I could have sanitized you could have sanitized she could have sanitized we could have sanitized you could have sanitized they could have sanitized
V-ing perfect
I could have been sanitizing you could have been sanitizing she could have been sanitizing we could have been sanitizing you could have been sanitizing they could have been sanitizing
Negation
Simple form
I could not sanitize you could not sanitize she could not sanitize we could not sanitize you could not sanitize they could not sanitize
V-ing form
I could not be sanitizing you could not be sanitizing she could not be sanitizing we could not be sanitizing you could not be sanitizing they could not be sanitizing
Perfect
I could not have sanitized you could not have sanitized she could not have sanitized we could not have sanitized you could not have sanitized they could not have sanitized
V-ing perfect
I could not have been sanitizing you could not have been sanitizing she could not have been sanitizing we could not have been sanitizing you could not have been sanitizing they could not have been sanitizing
Interrogative form
Simple form
could I sanitize? could you sanitize? could she sanitize? could we sanitize? could you sanitize? could they sanitize?
V-ing form
could I be sanitizing? could you be sanitizing? could she be sanitizing? could we be sanitizing? could you be sanitizing? could they be sanitizing?
Perfect
could I have sanitized? could you have sanitized? could she have sanitized? could we have sanitized? could you have sanitized? could they have sanitized?
V-ing perfect
could I have been sanitizing? could you have been sanitizing? could she have been sanitizing? could we have been sanitizing? could you have been sanitizing? could they have been sanitizing?
Interro-negative form
Simple form
could I not sanitize? could you not sanitize? could she not sanitize? could we not sanitize? could you not sanitize? could they not sanitize?
V-ing form
could I not be sanitizing? could you not be sanitizing? could she not be sanitizing? could we not be sanitizing? could you not be sanitizing? could they not be sanitizing?
Perfect
could I not have sanitized? could you not have sanitized? could she not have sanitized? could we not have sanitized? could you not have sanitized? could they not have sanitized?
V-ing perfect
could I not have been sanitizing? could you not have been sanitizing? could she not have been sanitizing? could we not have been sanitizing? could you not have been sanitizing? could they not have been sanitizing?