English verb conjugation
COULD BUG

Regular verb: bug - bugged - bugged

Affirmation

Simple form	V-ing form
I could bug you could bug she could bug we could bug you could bug they could bug	I could be bugging you could be bugging she could be bugging we could be bugging you could be bugging they could be bugging
Perfect	V-ing perfect
I could have bugged you could have bugged she could have bugged we could have bugged you could have bugged they could have bugged	I could have been bugging you could have been bugging she could have been bugging we could have been bugging you could have been bugging they could have been bugging

Negation

Simple form	V-ing form
I couldn't bug you couldn't bug she couldn't bug we couldn't bug you couldn't bug they couldn't bug	I couldn't be bugging you couldn't be bugging she couldn't be bugging we couldn't be bugging you couldn't be bugging they couldn't be bugging
Perfect	V-ing perfect
I couldn't have bugged you couldn't have bugged she couldn't have bugged we couldn't have bugged you couldn't have bugged they couldn't have bugged	I couldn't have been bugging you couldn't have been bugging she couldn't have been bugging we couldn't have been bugging you couldn't have been bugging they couldn't have been bugging

Interrogative form

Simple form	V-ing form
could I bug? could you bug? could she bug? could we bug? could you bug? could they bug?	could I be bugging? could you be bugging? could she be bugging? could we be bugging? could you be bugging? could they be bugging?
Perfect	V-ing perfect
could I have bugged? could you have bugged? could she have bugged? could we have bugged? could you have bugged? could they have bugged?	could I have been bugging? could you have been bugging? could she have been bugging? could we have been bugging? could you have been bugging? could they have been bugging?

Interro-negative form

Simple form	V-ing form
couldn't I bug? couldn't you bug? couldn't she bug? couldn't we bug? couldn't you bug? couldn't they bug?	couldn't I be bugging? couldn't you be bugging? couldn't she be bugging? couldn't we be bugging? couldn't you be bugging? couldn't they be bugging?
Perfect	V-ing perfect
couldn't I have bugged? couldn't you have bugged? couldn't she have bugged? couldn't we have bugged? couldn't you have bugged? couldn't they have bugged?	couldn't I have been bugging? couldn't you have been bugging? couldn't she have been bugging? couldn't we have been bugging? couldn't you have been bugging? couldn't they have been bugging?