could rubberize
Regular verb: rubberize - rubberized- rubberized

Affirmation 	
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I could rubberize
you could rubberize
he could rubberize
we could rubberize
you could rubberize
they could rubberize 	I could be rubberizing
you could be rubberizing
he could be rubberizing
we could be rubberizing
you could be rubberizing
they could be rubberizing	I could have rubberized
you could have rubberized
he could have rubberized
we could have rubberized
you could have rubberized
they could have rubberized	I could have been rubberizing
you could have been rubberizing
he could have been rubberizing
we could have been rubberizing
you could have been rubberizing
they could have been rubberizing	

Negation 	
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I couldn't rubberize
you couldn't rubberize
he couldn't rubberize
we couldn't rubberize
you couldn't rubberize
they couldn't rubberize 	I couldn't be rubberizing
you couldn't be rubberizing
he couldn't be rubberizing
we couldn't be rubberizing
you couldn't be rubberizing
they couldn't be rubberizing	I couldn't have rubberized
you couldn't have rubberized
he couldn't have rubberized
we couldn't have rubberized
you couldn't have rubberized
they couldn't have rubberized	I couldn't have been rubberizing
you couldn't have been rubberizing
he couldn't have been rubberizing
we couldn't have been rubberizing
you couldn't have been rubberizing
they couldn't have been rubberizing	

Interrogative form 	
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could I rubberize?
could you rubberize?
could he rubberize?
could we rubberize?
could you rubberize?
could they rubberize? 	could I be rubberizing?
could you be rubberizing?
could he be rubberizing?
could we be rubberizing?
could you be rubberizing?
could they be rubberizing? 	could I have rubberized?
could you have rubberized?
could he have rubberized?
could we have rubberized?
could you have rubberized?
could they have rubberized? 	could I have been rubberizing?
could you have been rubberizing?
could he have been rubberizing?
could we have been rubberizing?
could you have been rubberizing?
could they have been rubberizing? 	

Interro-negative form 	
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couldn't I rubberize?
couldn't you rubberize?
couldn't he rubberize?
couldn't we rubberize?
couldn't you rubberize?
couldn't they rubberize? 	couldn't I be rubberizing?
couldn't you be rubberizing?
couldn't he be rubberizing?
couldn't we be rubberizing?
couldn't you be rubberizing?
couldn't they be rubberizing? 	couldn't I have rubberized?
couldn't you have rubberized?
couldn't he have rubberized?
couldn't we have rubberized?
couldn't you have rubberized?
couldn't they have rubberized? 	couldn't I have been rubberizing?
couldn't you have been rubberizing?
couldn't he have been rubberizing?
couldn't we have been rubberizing?
couldn't you have been rubberizing?
couldn't they have been rubberizing?