English verb conjugation
COULD EXPLAIN

Regular verb: explain - explained - explained

Affirmation

Simple form	V-ing form
I could explain you could explain she could explain we could explain you could explain they could explain	I could be explaining you could be explaining she 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 she 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 she 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 she 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 she 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 she 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 she 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 she explain? could we explain? could you explain? could they explain?	could I be explaining? could you be explaining? could she 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 she 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 she 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 she 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 she 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 she 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 she not have been explaining? could we not have been explaining? could you not have been explaining? could they not have been explaining?