could vilipend
Regular verb: vilipend - vilipended- vilipended

Affirmation 	
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I could vilipend
you could vilipend
she could vilipend
we could vilipend
you could vilipend
they could vilipend 	I could be vilipending
you could be vilipending
she could be vilipending
we could be vilipending
you could be vilipending
they could be vilipending	I could have vilipended
you could have vilipended
she could have vilipended
we could have vilipended
you could have vilipended
they could have vilipended	I could have been vilipending
you could have been vilipending
she could have been vilipending
we could have been vilipending
you could have been vilipending
they could have been vilipending	

Negation 	
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I couldn't vilipend
you couldn't vilipend
she couldn't vilipend
we couldn't vilipend
you couldn't vilipend
they couldn't vilipend 	I couldn't be vilipending
you couldn't be vilipending
she couldn't be vilipending
we couldn't be vilipending
you couldn't be vilipending
they couldn't be vilipending	I couldn't have vilipended
you couldn't have vilipended
she couldn't have vilipended
we couldn't have vilipended
you couldn't have vilipended
they couldn't have vilipended	I couldn't have been vilipending
you couldn't have been vilipending
she couldn't have been vilipending
we couldn't have been vilipending
you couldn't have been vilipending
they couldn't have been vilipending	

Interrogative form 	
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could I vilipend?
could you vilipend?
could she vilipend?
could we vilipend?
could you vilipend?
could they vilipend? 	could I be vilipending?
could you be vilipending?
could she be vilipending?
could we be vilipending?
could you be vilipending?
could they be vilipending? 	could I have vilipended?
could you have vilipended?
could she have vilipended?
could we have vilipended?
could you have vilipended?
could they have vilipended? 	could I have been vilipending?
could you have been vilipending?
could she have been vilipending?
could we have been vilipending?
could you have been vilipending?
could they have been vilipending? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I vilipend?
couldn't you vilipend?
couldn't she vilipend?
couldn't we vilipend?
couldn't you vilipend?
couldn't they vilipend? 	couldn't I be vilipending?
couldn't you be vilipending?
couldn't she be vilipending?
couldn't we be vilipending?
couldn't you be vilipending?
couldn't they be vilipending? 	couldn't I have vilipended?
couldn't you have vilipended?
couldn't she have vilipended?
couldn't we have vilipended?
couldn't you have vilipended?
couldn't they have vilipended? 	couldn't I have been vilipending?
couldn't you have been vilipending?
couldn't she have been vilipending?
couldn't we have been vilipending?
couldn't you have been vilipending?
couldn't they have been vilipending?