could participate
Verbo regolare: participate - participated- participated

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I could participate
you could participate
she could participate
we could participate
you could participate
they could participate 	I could be participating
you could be participating
she could be participating
we could be participating
you could be participating
they could be participating	I could have participated
you could have participated
she could have participated
we could have participated
you could have participated
they could have participated	I could have been participating
you could have been participating
she could have been participating
we could have been participating
you could have been participating
they could have been participating	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I couldn't participate
you couldn't participate
she couldn't participate
we couldn't participate
you couldn't participate
they couldn't participate 	I couldn't be participating
you couldn't be participating
she couldn't be participating
we couldn't be participating
you couldn't be participating
they couldn't be participating	I couldn't have participated
you couldn't have participated
she couldn't have participated
we couldn't have participated
you couldn't have participated
they couldn't have participated	I couldn't have been participating
you couldn't have been participating
she couldn't have been participating
we couldn't have been participating
you couldn't have been participating
they couldn't have been participating	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
could I participate?
could you participate?
could she participate?
could we participate?
could you participate?
could they participate? 	could I be participating?
could you be participating?
could she be participating?
could we be participating?
could you be participating?
could they be participating? 	could I have participated?
could you have participated?
could she have participated?
could we have participated?
could you have participated?
could they have participated? 	could I have been participating?
could you have been participating?
could she have been participating?
could we have been participating?
could you have been participating?
could they have been participating? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
couldn't I participate?
couldn't you participate?
couldn't she participate?
couldn't we participate?
couldn't you participate?
couldn't they participate? 	couldn't I be participating?
couldn't you be participating?
couldn't she be participating?
couldn't we be participating?
couldn't you be participating?
couldn't they be participating? 	couldn't I have participated?
couldn't you have participated?
couldn't she have participated?
couldn't we have participated?
couldn't you have participated?
couldn't they have participated? 	couldn't I have been participating?
couldn't you have been participating?
couldn't she have been participating?
couldn't we have been participating?
couldn't you have been participating?
couldn't they have been participating?