could prewarn
Verbe régulier : prewarn - prewarned- prewarned

Affirmation 	
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I could prewarn
you could prewarn
she could prewarn
we could prewarn
you could prewarn
they could prewarn 	I could be prewarning
you could be prewarning
she could be prewarning
we could be prewarning
you could be prewarning
they could be prewarning	I could have prewarned
you could have prewarned
she could have prewarned
we could have prewarned
you could have prewarned
they could have prewarned	I could have been prewarning
you could have been prewarning
she could have been prewarning
we could have been prewarning
you could have been prewarning
they could have been prewarning	

Négation 	
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I couldn't prewarn
you couldn't prewarn
she couldn't prewarn
we couldn't prewarn
you couldn't prewarn
they couldn't prewarn 	I couldn't be prewarning
you couldn't be prewarning
she couldn't be prewarning
we couldn't be prewarning
you couldn't be prewarning
they couldn't be prewarning	I couldn't have prewarned
you couldn't have prewarned
she couldn't have prewarned
we couldn't have prewarned
you couldn't have prewarned
they couldn't have prewarned	I couldn't have been prewarning
you couldn't have been prewarning
she couldn't have been prewarning
we couldn't have been prewarning
you couldn't have been prewarning
they couldn't have been prewarning	

Forme interrogative 	
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could I prewarn?
could you prewarn?
could she prewarn?
could we prewarn?
could you prewarn?
could they prewarn? 	could I be prewarning?
could you be prewarning?
could she be prewarning?
could we be prewarning?
could you be prewarning?
could they be prewarning? 	could I have prewarned?
could you have prewarned?
could she have prewarned?
could we have prewarned?
could you have prewarned?
could they have prewarned? 	could I have been prewarning?
could you have been prewarning?
could she have been prewarning?
could we have been prewarning?
could you have been prewarning?
could they have been prewarning? 	

Forme interro-négative 	
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couldn't I prewarn?
couldn't you prewarn?
couldn't she prewarn?
couldn't we prewarn?
couldn't you prewarn?
couldn't they prewarn? 	couldn't I be prewarning?
couldn't you be prewarning?
couldn't she be prewarning?
couldn't we be prewarning?
couldn't you be prewarning?
couldn't they be prewarning? 	couldn't I have prewarned?
couldn't you have prewarned?
couldn't she have prewarned?
couldn't we have prewarned?
couldn't you have prewarned?
couldn't they have prewarned? 	couldn't I have been prewarning?
couldn't you have been prewarning?
couldn't she have been prewarning?
couldn't we have been prewarning?
couldn't you have been prewarning?
couldn't they have been prewarning?