Verbo regular: participate - participated - participated
Afirmação
Forma simple
I could participate you could participate he could participate we could participate you could participate they could participate
Forma com V-ing
I could be participating you could be participating he could be participating we could be participating you could be participating they could be participating
Perfeito
I could have participated you could have participated he could have participated we could have participated you could have participated they could have participated
Perfeito com V-ing
I could have been participating you could have been participating he could have been participating we could have been participating you could have been participating they could have been participating
Negação
Forma simple
I couldn't participate you couldn't participate he couldn't participate we couldn't participate you couldn't participate they couldn't participate
Forma com V-ing
I couldn't be participating you couldn't be participating he couldn't be participating we couldn't be participating you couldn't be participating they couldn't be participating
Perfeito
I couldn't have participated you couldn't have participated he couldn't have participated we couldn't have participated you couldn't have participated they couldn't have participated
Perfeito com V-ing
I couldn't have been participating you couldn't have been participating he 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 simple
could I participate? could you participate? could he participate? could we participate? could you participate? could they participate?
Forma com V-ing
could I be participating? could you be participating? could he be participating? could we be participating? could you be participating? could they be participating?
Perfeito
could I have participated? could you have participated? could he have participated? could we have participated? could you have participated? could they have participated?
Perfeito com V-ing
could I have been participating? could you have been participating? could he have been participating? could we have been participating? could you have been participating? could they have been participating?
Forma interro-Negação
Forma simple
couldn't I participate? couldn't you participate? couldn't he participate? couldn't we participate? couldn't you participate? couldn't they participate?
Forma com V-ing
couldn't I be participating? couldn't you be participating? couldn't he be participating? couldn't we be participating? couldn't you be participating? couldn't they be participating?
Perfeito
couldn't I have participated? couldn't you have participated? couldn't he have participated? couldn't we have participated? couldn't you have participated? couldn't they have participated?
Perfeito com V-ing
couldn't I have been participating? couldn't you have been participating? couldn't he have been participating? couldn't we have been participating? couldn't you have been participating? couldn't they have been participating?