could sanitize
Regular verb: sanitize - sanitized- sanitized

Affirmation 	
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I could sanitize
you could sanitize
he could sanitize
we could sanitize
you could sanitize
they could sanitize 	I could be sanitizing
you could be sanitizing
he could be sanitizing
we could be sanitizing
you could be sanitizing
they could be sanitizing	I could have sanitized
you could have sanitized
he could have sanitized
we could have sanitized
you could have sanitized
they could have sanitized	I could have been sanitizing
you could have been sanitizing
he could have been sanitizing
we could have been sanitizing
you could have been sanitizing
they could have been sanitizing	

Negation 	
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I couldn't sanitize
you couldn't sanitize
he couldn't sanitize
we couldn't sanitize
you couldn't sanitize
they couldn't sanitize 	I couldn't be sanitizing
you couldn't be sanitizing
he couldn't be sanitizing
we couldn't be sanitizing
you couldn't be sanitizing
they couldn't be sanitizing	I couldn't have sanitized
you couldn't have sanitized
he couldn't have sanitized
we couldn't have sanitized
you couldn't have sanitized
they couldn't have sanitized	I couldn't have been sanitizing
you couldn't have been sanitizing
he couldn't have been sanitizing
we couldn't have been sanitizing
you couldn't have been sanitizing
they couldn't have been sanitizing	

Interrogative form 	
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could I sanitize?
could you sanitize?
could he sanitize?
could we sanitize?
could you sanitize?
could they sanitize? 	could I be sanitizing?
could you be sanitizing?
could he be sanitizing?
could we be sanitizing?
could you be sanitizing?
could they be sanitizing? 	could I have sanitized?
could you have sanitized?
could he have sanitized?
could we have sanitized?
could you have sanitized?
could they have sanitized? 	could I have been sanitizing?
could you have been sanitizing?
could he have been sanitizing?
could we have been sanitizing?
could you have been sanitizing?
could they have been sanitizing? 	

Interro-negative form 	
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couldn't I sanitize?
couldn't you sanitize?
couldn't he sanitize?
couldn't we sanitize?
couldn't you sanitize?
couldn't they sanitize? 	couldn't I be sanitizing?
couldn't you be sanitizing?
couldn't he be sanitizing?
couldn't we be sanitizing?
couldn't you be sanitizing?
couldn't they be sanitizing? 	couldn't I have sanitized?
couldn't you have sanitized?
couldn't he have sanitized?
couldn't we have sanitized?
couldn't you have sanitized?
couldn't they have sanitized? 	couldn't I have been sanitizing?
couldn't you have been sanitizing?
couldn't he have been sanitizing?
couldn't we have been sanitizing?
couldn't you have been sanitizing?
couldn't they have been sanitizing?