Regular verb: quiver - quivered - quivered
Simple form | V-ing form |
I could quiver you could quiver she could quiver we could quiver you could quiver they could quiver | I could be quivering you could be quivering she could be quivering we could be quivering you could be quivering they could be quivering |
Perfect | V-ing perfect |
I could have quivered you could have quivered she could have quivered we could have quivered you could have quivered they could have quivered | I could have been quivering you could have been quivering she could have been quivering we could have been quivering you could have been quivering they could have been quivering |
Simple form | V-ing form |
I couldn't quiver you couldn't quiver she couldn't quiver we couldn't quiver you couldn't quiver they couldn't quiver | I couldn't be quivering you couldn't be quivering she couldn't be quivering we couldn't be quivering you couldn't be quivering they couldn't be quivering |
Perfect | V-ing perfect |
I couldn't have quivered you couldn't have quivered she couldn't have quivered we couldn't have quivered you couldn't have quivered they couldn't have quivered | I couldn't have been quivering you couldn't have been quivering she couldn't have been quivering we couldn't have been quivering you couldn't have been quivering they couldn't have been quivering |
Simple form | V-ing form |
could I quiver? could you quiver? could she quiver? could we quiver? could you quiver? could they quiver? | could I be quivering? could you be quivering? could she be quivering? could we be quivering? could you be quivering? could they be quivering? |
Perfect | V-ing perfect |
could I have quivered? could you have quivered? could she have quivered? could we have quivered? could you have quivered? could they have quivered? | could I have been quivering? could you have been quivering? could she have been quivering? could we have been quivering? could you have been quivering? could they have been quivering? |
Simple form | V-ing form |
couldn't I quiver? couldn't you quiver? couldn't she quiver? couldn't we quiver? couldn't you quiver? couldn't they quiver? | couldn't I be quivering? couldn't you be quivering? couldn't she be quivering? couldn't we be quivering? couldn't you be quivering? couldn't they be quivering? |
Perfect | V-ing perfect |
couldn't I have quivered? couldn't you have quivered? couldn't she have quivered? couldn't we have quivered? couldn't you have quivered? couldn't they have quivered? | couldn't I have been quivering? couldn't you have been quivering? couldn't she have been quivering? couldn't we have been quivering? couldn't you have been quivering? couldn't they have been quivering? |