could antiquate
Regular verb: antiquate - antiquated- antiquated

Affirmation 	
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I could antiquate
you could antiquate
she could antiquate
we could antiquate
you could antiquate
they could antiquate 	I could be antiquating
you could be antiquating
she could be antiquating
we could be antiquating
you could be antiquating
they could be antiquating	I could have antiquated
you could have antiquated
she could have antiquated
we could have antiquated
you could have antiquated
they could have antiquated	I could have been antiquating
you could have been antiquating
she could have been antiquating
we could have been antiquating
you could have been antiquating
they could have been antiquating	

Negation 	
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I couldn't antiquate
you couldn't antiquate
she couldn't antiquate
we couldn't antiquate
you couldn't antiquate
they couldn't antiquate 	I couldn't be antiquating
you couldn't be antiquating
she couldn't be antiquating
we couldn't be antiquating
you couldn't be antiquating
they couldn't be antiquating	I couldn't have antiquated
you couldn't have antiquated
she couldn't have antiquated
we couldn't have antiquated
you couldn't have antiquated
they couldn't have antiquated	I couldn't have been antiquating
you couldn't have been antiquating
she couldn't have been antiquating
we couldn't have been antiquating
you couldn't have been antiquating
they couldn't have been antiquating	

Interrogative form 	
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could I antiquate?
could you antiquate?
could she antiquate?
could we antiquate?
could you antiquate?
could they antiquate? 	could I be antiquating?
could you be antiquating?
could she be antiquating?
could we be antiquating?
could you be antiquating?
could they be antiquating? 	could I have antiquated?
could you have antiquated?
could she have antiquated?
could we have antiquated?
could you have antiquated?
could they have antiquated? 	could I have been antiquating?
could you have been antiquating?
could she have been antiquating?
could we have been antiquating?
could you have been antiquating?
could they have been antiquating? 	

Interro-negative form 	
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couldn't I antiquate?
couldn't you antiquate?
couldn't she antiquate?
couldn't we antiquate?
couldn't you antiquate?
couldn't they antiquate? 	couldn't I be antiquating?
couldn't you be antiquating?
couldn't she be antiquating?
couldn't we be antiquating?
couldn't you be antiquating?
couldn't they be antiquating? 	couldn't I have antiquated?
couldn't you have antiquated?
couldn't she have antiquated?
couldn't we have antiquated?
couldn't you have antiquated?
couldn't they have antiquated? 	couldn't I have been antiquating?
couldn't you have been antiquating?
couldn't she have been antiquating?
couldn't we have been antiquating?
couldn't you have been antiquating?
couldn't they have been antiquating?