English verb conjugation
COULD PROTECT

Regular verb: protect - protected - protected

Affirmation

Simple form	V-ing form
I could protect you could protect he could protect we could protect you could protect they could protect	I could be protecting you could be protecting he could be protecting we could be protecting you could be protecting they could be protecting
Perfect	V-ing perfect
I could have protected you could have protected he could have protected we could have protected you could have protected they could have protected	I could have been protecting you could have been protecting he could have been protecting we could have been protecting you could have been protecting they could have been protecting

Negation

Simple form	V-ing form
I could not protect you could not protect he could not protect we could not protect you could not protect they could not protect	I could not be protecting you could not be protecting he could not be protecting we could not be protecting you could not be protecting they could not be protecting
Perfect	V-ing perfect
I could not have protected you could not have protected he could not have protected we could not have protected you could not have protected they could not have protected	I could not have been protecting you could not have been protecting he could not have been protecting we could not have been protecting you could not have been protecting they could not have been protecting

Interrogative form

Simple form	V-ing form
could I protect? could you protect? could he protect? could we protect? could you protect? could they protect?	could I be protecting? could you be protecting? could he be protecting? could we be protecting? could you be protecting? could they be protecting?
Perfect	V-ing perfect
could I have protected? could you have protected? could he have protected? could we have protected? could you have protected? could they have protected?	could I have been protecting? could you have been protecting? could he have been protecting? could we have been protecting? could you have been protecting? could they have been protecting?

Interro-negative form

Simple form	V-ing form
could I not protect? could you not protect? could he not protect? could we not protect? could you not protect? could they not protect?	could I not be protecting? could you not be protecting? could he not be protecting? could we not be protecting? could you not be protecting? could they not be protecting?
Perfect	V-ing perfect
could I not have protected? could you not have protected? could he not have protected? could we not have protected? could you not have protected? could they not have protected?	could I not have been protecting? could you not have been protecting? could he not have been protecting? could we not have been protecting? could you not have been protecting? could they not have been protecting?