English verb conjugation
COULD PARTICIPATE

Regular verb: participate - participated - participated

Affirmation

Simple form	V-ing form
I could participate you could participate he could participate we could participate you could participate they could participate	I could be participating you could be participating he could be participating we could be participating you could be participating they could be participating
Perfect	V-ing perfect
I could have participated you could have participated he 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 he could have been participating we could have been participating you could have been participating they could have been participating

Negation

Simple form	V-ing form
I couldn't participate you couldn't participate he 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 he couldn't be participating we couldn't be participating you couldn't be participating they couldn't be participating
Perfect	V-ing perfect
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	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

Interrogative form

Simple form	V-ing form
could I participate? could you participate? could he participate? could we participate? could you participate? could they participate?	could I be participating? could you be participating? could he be participating? could we be participating? could you be participating? could they be participating?
Perfect	V-ing perfect
could I have participated? could you have participated? could he 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 he have been participating? could we have been participating? could you have been participating? could they have been participating?

Interro-negative form

Simple form	V-ing form
couldn't I participate? couldn't you participate? couldn't he 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 he be participating? couldn't we be participating? couldn't you be participating? couldn't they be participating?
Perfect	V-ing perfect
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?	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?