could sphere
Verbe régulier : sphere - sphered- sphered

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could sphere
you could sphere
she could sphere
we could sphere
you could sphere
they could sphere 	I could be sphering
you could be sphering
she could be sphering
we could be sphering
you could be sphering
they could be sphering	I could have sphered
you could have sphered
she could have sphered
we could have sphered
you could have sphered
they could have sphered	I could have been sphering
you could have been sphering
she could have been sphering
we could have been sphering
you could have been sphering
they could have been sphering	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I couldn't sphere
you couldn't sphere
she couldn't sphere
we couldn't sphere
you couldn't sphere
they couldn't sphere 	I couldn't be sphering
you couldn't be sphering
she couldn't be sphering
we couldn't be sphering
you couldn't be sphering
they couldn't be sphering	I couldn't have sphered
you couldn't have sphered
she couldn't have sphered
we couldn't have sphered
you couldn't have sphered
they couldn't have sphered	I couldn't have been sphering
you couldn't have been sphering
she couldn't have been sphering
we couldn't have been sphering
you couldn't have been sphering
they couldn't have been sphering	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I sphere?
could you sphere?
could she sphere?
could we sphere?
could you sphere?
could they sphere? 	could I be sphering?
could you be sphering?
could she be sphering?
could we be sphering?
could you be sphering?
could they be sphering? 	could I have sphered?
could you have sphered?
could she have sphered?
could we have sphered?
could you have sphered?
could they have sphered? 	could I have been sphering?
could you have been sphering?
could she have been sphering?
could we have been sphering?
could you have been sphering?
could they have been sphering? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
couldn't I sphere?
couldn't you sphere?
couldn't she sphere?
couldn't we sphere?
couldn't you sphere?
couldn't they sphere? 	couldn't I be sphering?
couldn't you be sphering?
couldn't she be sphering?
couldn't we be sphering?
couldn't you be sphering?
couldn't they be sphering? 	couldn't I have sphered?
couldn't you have sphered?
couldn't she have sphered?
couldn't we have sphered?
couldn't you have sphered?
couldn't they have sphered? 	couldn't I have been sphering?
couldn't you have been sphering?
couldn't she have been sphering?
couldn't we have been sphering?
couldn't you have been sphering?
couldn't they have been sphering?