could aspirate
Regular verb: aspirate - aspirated- aspirated

Affirmation 	
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I could aspirate
you could aspirate
she could aspirate
we could aspirate
you could aspirate
they could aspirate 	I could be aspirating
you could be aspirating
she could be aspirating
we could be aspirating
you could be aspirating
they could be aspirating	I could have aspirated
you could have aspirated
she could have aspirated
we could have aspirated
you could have aspirated
they could have aspirated	I could have been aspirating
you could have been aspirating
she could have been aspirating
we could have been aspirating
you could have been aspirating
they could have been aspirating	

Negation 	
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I couldn't aspirate
you couldn't aspirate
she couldn't aspirate
we couldn't aspirate
you couldn't aspirate
they couldn't aspirate 	I couldn't be aspirating
you couldn't be aspirating
she couldn't be aspirating
we couldn't be aspirating
you couldn't be aspirating
they couldn't be aspirating	I couldn't have aspirated
you couldn't have aspirated
she couldn't have aspirated
we couldn't have aspirated
you couldn't have aspirated
they couldn't have aspirated	I couldn't have been aspirating
you couldn't have been aspirating
she couldn't have been aspirating
we couldn't have been aspirating
you couldn't have been aspirating
they couldn't have been aspirating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I aspirate?
could you aspirate?
could she aspirate?
could we aspirate?
could you aspirate?
could they aspirate? 	could I be aspirating?
could you be aspirating?
could she be aspirating?
could we be aspirating?
could you be aspirating?
could they be aspirating? 	could I have aspirated?
could you have aspirated?
could she have aspirated?
could we have aspirated?
could you have aspirated?
could they have aspirated? 	could I have been aspirating?
could you have been aspirating?
could she have been aspirating?
could we have been aspirating?
could you have been aspirating?
could they have been aspirating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I aspirate?
couldn't you aspirate?
couldn't she aspirate?
couldn't we aspirate?
couldn't you aspirate?
couldn't they aspirate? 	couldn't I be aspirating?
couldn't you be aspirating?
couldn't she be aspirating?
couldn't we be aspirating?
couldn't you be aspirating?
couldn't they be aspirating? 	couldn't I have aspirated?
couldn't you have aspirated?
couldn't she have aspirated?
couldn't we have aspirated?
couldn't you have aspirated?
couldn't they have aspirated? 	couldn't I have been aspirating?
couldn't you have been aspirating?
couldn't she have been aspirating?
couldn't we have been aspirating?
couldn't you have been aspirating?
couldn't they have been aspirating?