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 couldn't explain you couldn't explain he couldn't explain we couldn't explain you couldn't explain they couldn't explain	I couldn't be explaining you couldn't be explaining he couldn't be explaining we couldn't be explaining you couldn't be explaining they couldn't be explaining
Perfect	V-ing perfect
I couldn't have explained you couldn't have explained he couldn't have explained we couldn't have explained you couldn't have explained they couldn't have explained	I couldn't have been explaining you couldn't have been explaining he couldn't have been explaining we couldn't have been explaining you couldn't have been explaining they couldn't 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
couldn't I explain? couldn't you explain? couldn't he explain? couldn't we explain? couldn't you explain? couldn't they explain?	couldn't I be explaining? couldn't you be explaining? couldn't he be explaining? couldn't we be explaining? couldn't you be explaining? couldn't they be explaining?
Perfect	V-ing perfect
couldn't I have explained? couldn't you have explained? couldn't he have explained? couldn't we have explained? couldn't you have explained? couldn't they have explained?	couldn't I have been explaining? couldn't you have been explaining? couldn't he have been explaining? couldn't we have been explaining? couldn't you have been explaining? couldn't they have been explaining?