could sex
Regular verb: sex - sexed- sexed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could sex
you could sex
she could sex
we could sex
you could sex
they could sex 	I could be sexing
you could be sexing
she could be sexing
we could be sexing
you could be sexing
they could be sexing	I could have sexed
you could have sexed
she could have sexed
we could have sexed
you could have sexed
they could have sexed	I could have been sexing
you could have been sexing
she could have been sexing
we could have been sexing
you could have been sexing
they could have been sexing	

Negation 	
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I couldn't sex
you couldn't sex
she couldn't sex
we couldn't sex
you couldn't sex
they couldn't sex 	I couldn't be sexing
you couldn't be sexing
she couldn't be sexing
we couldn't be sexing
you couldn't be sexing
they couldn't be sexing	I couldn't have sexed
you couldn't have sexed
she couldn't have sexed
we couldn't have sexed
you couldn't have sexed
they couldn't have sexed	I couldn't have been sexing
you couldn't have been sexing
she couldn't have been sexing
we couldn't have been sexing
you couldn't have been sexing
they couldn't have been sexing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I sex?
could you sex?
could she sex?
could we sex?
could you sex?
could they sex? 	could I be sexing?
could you be sexing?
could she be sexing?
could we be sexing?
could you be sexing?
could they be sexing? 	could I have sexed?
could you have sexed?
could she have sexed?
could we have sexed?
could you have sexed?
could they have sexed? 	could I have been sexing?
could you have been sexing?
could she have been sexing?
could we have been sexing?
could you have been sexing?
could they have been sexing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I sex?
couldn't you sex?
couldn't she sex?
couldn't we sex?
couldn't you sex?
couldn't they sex? 	couldn't I be sexing?
couldn't you be sexing?
couldn't she be sexing?
couldn't we be sexing?
couldn't you be sexing?
couldn't they be sexing? 	couldn't I have sexed?
couldn't you have sexed?
couldn't she have sexed?
couldn't we have sexed?
couldn't you have sexed?
couldn't they have sexed? 	couldn't I have been sexing?
couldn't you have been sexing?
couldn't she have been sexing?
couldn't we have been sexing?
couldn't you have been sexing?
couldn't they have been sexing?