English verb conjugation
COULD LAG

Regular verb: lag - lagged - lagged

Affirmation

Simple form	V-ing form
I could lag you could lag she could lag we could lag you could lag they could lag	I could be lagging you could be lagging she 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 she 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 she 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 couldn't lag you couldn't lag she couldn't lag we couldn't lag you couldn't lag they couldn't lag	I couldn't be lagging you couldn't be lagging she couldn't be lagging we couldn't be lagging you couldn't be lagging they couldn't be lagging
Perfect	V-ing perfect
I couldn't have lagged you couldn't have lagged she couldn't have lagged we couldn't have lagged you couldn't have lagged they couldn't have lagged	I couldn't have been lagging you couldn't have been lagging she couldn't have been lagging we couldn't have been lagging you couldn't have been lagging they couldn't have been lagging

Interrogative form

Simple form	V-ing form
could I lag? could you lag? could she lag? could we lag? could you lag? could they lag?	could I be lagging? could you be lagging? could she 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 she 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 she 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
couldn't I lag? couldn't you lag? couldn't she lag? couldn't we lag? couldn't you lag? couldn't they lag?	couldn't I be lagging? couldn't you be lagging? couldn't she be lagging? couldn't we be lagging? couldn't you be lagging? couldn't they be lagging?
Perfect	V-ing perfect
couldn't I have lagged? couldn't you have lagged? couldn't she have lagged? couldn't we have lagged? couldn't you have lagged? couldn't they have lagged?	couldn't I have been lagging? couldn't you have been lagging? couldn't she have been lagging? couldn't we have been lagging? couldn't you have been lagging? couldn't they have been lagging?