could sanitise
Regular verb: sanitise - sanitised- sanitised

Affirmation 	
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I could sanitise
you could sanitise
he could sanitise
we could sanitise
you could sanitise
they could sanitise 	I could be sanitising
you could be sanitising
he could be sanitising
we could be sanitising
you could be sanitising
they could be sanitising	I could have sanitised
you could have sanitised
he could have sanitised
we could have sanitised
you could have sanitised
they could have sanitised	I could have been sanitising
you could have been sanitising
he could have been sanitising
we could have been sanitising
you could have been sanitising
they could have been sanitising	

Negation 	
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I couldn't sanitise
you couldn't sanitise
he couldn't sanitise
we couldn't sanitise
you couldn't sanitise
they couldn't sanitise 	I couldn't be sanitising
you couldn't be sanitising
he couldn't be sanitising
we couldn't be sanitising
you couldn't be sanitising
they couldn't be sanitising	I couldn't have sanitised
you couldn't have sanitised
he couldn't have sanitised
we couldn't have sanitised
you couldn't have sanitised
they couldn't have sanitised	I couldn't have been sanitising
you couldn't have been sanitising
he couldn't have been sanitising
we couldn't have been sanitising
you couldn't have been sanitising
they couldn't have been sanitising	

Interrogative form 	
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could I sanitise?
could you sanitise?
could he sanitise?
could we sanitise?
could you sanitise?
could they sanitise? 	could I be sanitising?
could you be sanitising?
could he be sanitising?
could we be sanitising?
could you be sanitising?
could they be sanitising? 	could I have sanitised?
could you have sanitised?
could he have sanitised?
could we have sanitised?
could you have sanitised?
could they have sanitised? 	could I have been sanitising?
could you have been sanitising?
could he have been sanitising?
could we have been sanitising?
could you have been sanitising?
could they have been sanitising? 	

Interro-negative form 	
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couldn't I sanitise?
couldn't you sanitise?
couldn't he sanitise?
couldn't we sanitise?
couldn't you sanitise?
couldn't they sanitise? 	couldn't I be sanitising?
couldn't you be sanitising?
couldn't he be sanitising?
couldn't we be sanitising?
couldn't you be sanitising?
couldn't they be sanitising? 	couldn't I have sanitised?
couldn't you have sanitised?
couldn't he have sanitised?
couldn't we have sanitised?
couldn't you have sanitised?
couldn't they have sanitised? 	couldn't I have been sanitising?
couldn't you have been sanitising?
couldn't he have been sanitising?
couldn't we have been sanitising?
couldn't you have been sanitising?
couldn't they have been sanitising?