English verb conjugation
COULD LAG

Regular verb: lag - lagged - lagged

Affirmation

Simple form	V-ing form
I could lag you could lag he could lag we could lag you could lag they could lag	I could be lagging you could be lagging he could be lagging we could be lagging you could be lagging they could be lagging
Perfect	V-ing perfect
I could have lagged you could have lagged he could have lagged we could have lagged you could have lagged they could have lagged	I could have been lagging you could have been lagging he could have been lagging we could have been lagging you could have been lagging they could have been lagging

Negation

Simple form	V-ing form
I could not lag you could not lag he could not lag we could not lag you could not lag they could not lag	I could not be lagging you could not be lagging he could not be lagging we could not be lagging you could not be lagging they could not be lagging
Perfect	V-ing perfect
I could not have lagged you could not have lagged he could not have lagged we could not have lagged you could not have lagged they could not have lagged	I could not have been lagging you could not have been lagging he could not have been lagging we could not have been lagging you could not have been lagging they could not have been lagging

Interrogative form

Simple form	V-ing form
could I lag? could you lag? could he lag? could we lag? could you lag? could they lag?	could I be lagging? could you be lagging? could he be lagging? could we be lagging? could you be lagging? could they be lagging?
Perfect	V-ing perfect
could I have lagged? could you have lagged? could he have lagged? could we have lagged? could you have lagged? could they have lagged?	could I have been lagging? could you have been lagging? could he have been lagging? could we have been lagging? could you have been lagging? could they have been lagging?

Interro-negative form

Simple form	V-ing form
could I not lag? could you not lag? could he not lag? could we not lag? could you not lag? could they not lag?	could I not be lagging? could you not be lagging? could he not be lagging? could we not be lagging? could you not be lagging? could they not be lagging?
Perfect	V-ing perfect
could I not have lagged? could you not have lagged? could he not have lagged? could we not have lagged? could you not have lagged? could they not have lagged?	could I not have been lagging? could you not have been lagging? could he not have been lagging? could we not have been lagging? could you not have been lagging? could they not have been lagging?