could lubricant
Regular verb: lubricant - lubricanted- lubricanted

Affirmation 	
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I could lubricant
you could lubricant
he could lubricant
we could lubricant
you could lubricant
they could lubricant 	I could be lubricanting
you could be lubricanting
he could be lubricanting
we could be lubricanting
you could be lubricanting
they could be lubricanting	I could have lubricanted
you could have lubricanted
he could have lubricanted
we could have lubricanted
you could have lubricanted
they could have lubricanted	I could have been lubricanting
you could have been lubricanting
he could have been lubricanting
we could have been lubricanting
you could have been lubricanting
they could have been lubricanting	

Negation 	
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I couldn't lubricant
you couldn't lubricant
he couldn't lubricant
we couldn't lubricant
you couldn't lubricant
they couldn't lubricant 	I couldn't be lubricanting
you couldn't be lubricanting
he couldn't be lubricanting
we couldn't be lubricanting
you couldn't be lubricanting
they couldn't be lubricanting	I couldn't have lubricanted
you couldn't have lubricanted
he couldn't have lubricanted
we couldn't have lubricanted
you couldn't have lubricanted
they couldn't have lubricanted	I couldn't have been lubricanting
you couldn't have been lubricanting
he couldn't have been lubricanting
we couldn't have been lubricanting
you couldn't have been lubricanting
they couldn't have been lubricanting	

Interrogative form 	
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could I lubricant?
could you lubricant?
could he lubricant?
could we lubricant?
could you lubricant?
could they lubricant? 	could I be lubricanting?
could you be lubricanting?
could he be lubricanting?
could we be lubricanting?
could you be lubricanting?
could they be lubricanting? 	could I have lubricanted?
could you have lubricanted?
could he have lubricanted?
could we have lubricanted?
could you have lubricanted?
could they have lubricanted? 	could I have been lubricanting?
could you have been lubricanting?
could he have been lubricanting?
could we have been lubricanting?
could you have been lubricanting?
could they have been lubricanting? 	

Interro-negative form 	
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couldn't I lubricant?
couldn't you lubricant?
couldn't he lubricant?
couldn't we lubricant?
couldn't you lubricant?
couldn't they lubricant? 	couldn't I be lubricanting?
couldn't you be lubricanting?
couldn't he be lubricanting?
couldn't we be lubricanting?
couldn't you be lubricanting?
couldn't they be lubricanting? 	couldn't I have lubricanted?
couldn't you have lubricanted?
couldn't he have lubricanted?
couldn't we have lubricanted?
couldn't you have lubricanted?
couldn't they have lubricanted? 	couldn't I have been lubricanting?
couldn't you have been lubricanting?
couldn't he have been lubricanting?
couldn't we have been lubricanting?
couldn't you have been lubricanting?
couldn't they have been lubricanting?