English verb conjugation
COULD EXPLAIN

Regular verb: explain - explained - explained

Affirmation

Simple form	V-ing form
I could explain you could explain he could explain we could explain you could explain they could explain	I could be explaining you could be explaining he could be explaining we could be explaining you could be explaining they could be explaining
Perfect	V-ing perfect
I could have explained you could have explained he could have explained we could have explained you could have explained they could have explained	I could have been explaining you could have been explaining he could have been explaining we could have been explaining you could have been explaining they could have been explaining

Negation

Simple form	V-ing form
I could not explain you could not explain he could not explain we could not explain you could not explain they could not explain	I could not be explaining you could not be explaining he could not be explaining we could not be explaining you could not be explaining they could not be explaining
Perfect	V-ing perfect
I could not have explained you could not have explained he could not have explained we could not have explained you could not have explained they could not have explained	I could not have been explaining you could not have been explaining he could not have been explaining we could not have been explaining you could not have been explaining they could not have been explaining

Interrogative form

Simple form	V-ing form
could I explain? could you explain? could he explain? could we explain? could you explain? could they explain?	could I be explaining? could you be explaining? could he be explaining? could we be explaining? could you be explaining? could they be explaining?
Perfect	V-ing perfect
could I have explained? could you have explained? could he have explained? could we have explained? could you have explained? could they have explained?	could I have been explaining? could you have been explaining? could he have been explaining? could we have been explaining? could you have been explaining? could they have been explaining?

Interro-negative form

Simple form	V-ing form
could I not explain? could you not explain? could he not explain? could we not explain? could you not explain? could they not explain?	could I not be explaining? could you not be explaining? could he not be explaining? could we not be explaining? could you not be explaining? could they not be explaining?
Perfect	V-ing perfect
could I not have explained? could you not have explained? could he not have explained? could we not have explained? could you not have explained? could they not have explained?	could I not have been explaining? could you not have been explaining? could he not have been explaining? could we not have been explaining? could you not have been explaining? could they not have been explaining?