English verb conjugation
COULD LESSON

Regular verb: lesson - lessoned - lessoned

Affirmation

Simple form	V-ing form
I could lesson you could lesson he could lesson we could lesson you could lesson they could lesson	I could be lessoning you could be lessoning he could be lessoning we could be lessoning you could be lessoning they could be lessoning
Perfect	V-ing perfect
I could have lessoned you could have lessoned he could have lessoned we could have lessoned you could have lessoned they could have lessoned	I could have been lessoning you could have been lessoning he could have been lessoning we could have been lessoning you could have been lessoning they could have been lessoning

Negation

Simple form	V-ing form
I couldn't lesson you couldn't lesson he couldn't lesson we couldn't lesson you couldn't lesson they couldn't lesson	I couldn't be lessoning you couldn't be lessoning he couldn't be lessoning we couldn't be lessoning you couldn't be lessoning they couldn't be lessoning
Perfect	V-ing perfect
I couldn't have lessoned you couldn't have lessoned he couldn't have lessoned we couldn't have lessoned you couldn't have lessoned they couldn't have lessoned	I couldn't have been lessoning you couldn't have been lessoning he couldn't have been lessoning we couldn't have been lessoning you couldn't have been lessoning they couldn't have been lessoning

Interrogative form

Simple form	V-ing form
could I lesson? could you lesson? could he lesson? could we lesson? could you lesson? could they lesson?	could I be lessoning? could you be lessoning? could he be lessoning? could we be lessoning? could you be lessoning? could they be lessoning?
Perfect	V-ing perfect
could I have lessoned? could you have lessoned? could he have lessoned? could we have lessoned? could you have lessoned? could they have lessoned?	could I have been lessoning? could you have been lessoning? could he have been lessoning? could we have been lessoning? could you have been lessoning? could they have been lessoning?

Interro-negative form

Simple form	V-ing form
couldn't I lesson? couldn't you lesson? couldn't he lesson? couldn't we lesson? couldn't you lesson? couldn't they lesson?	couldn't I be lessoning? couldn't you be lessoning? couldn't he be lessoning? couldn't we be lessoning? couldn't you be lessoning? couldn't they be lessoning?
Perfect	V-ing perfect
couldn't I have lessoned? couldn't you have lessoned? couldn't he have lessoned? couldn't we have lessoned? couldn't you have lessoned? couldn't they have lessoned?	couldn't I have been lessoning? couldn't you have been lessoning? couldn't he have been lessoning? couldn't we have been lessoning? couldn't you have been lessoning? couldn't they have been lessoning?