I could flounder you could flounder she could flounder we could flounder you could flounder they could flounder
V-ing form
I could be floundering you could be floundering she could be floundering we could be floundering you could be floundering they could be floundering
Perfect
I could have floundered you could have floundered she could have floundered we could have floundered you could have floundered they could have floundered
V-ing perfect
I could have been floundering you could have been floundering she could have been floundering we could have been floundering you could have been floundering they could have been floundering
Negation
Simple form
I couldn't flounder you couldn't flounder she couldn't flounder we couldn't flounder you couldn't flounder they couldn't flounder
V-ing form
I couldn't be floundering you couldn't be floundering she couldn't be floundering we couldn't be floundering you couldn't be floundering they couldn't be floundering
Perfect
I couldn't have floundered you couldn't have floundered she couldn't have floundered we couldn't have floundered you couldn't have floundered they couldn't have floundered
V-ing perfect
I couldn't have been floundering you couldn't have been floundering she couldn't have been floundering we couldn't have been floundering you couldn't have been floundering they couldn't have been floundering
Interrogative form
Simple form
could I flounder? could you flounder? could she flounder? could we flounder? could you flounder? could they flounder?
V-ing form
could I be floundering? could you be floundering? could she be floundering? could we be floundering? could you be floundering? could they be floundering?
Perfect
could I have floundered? could you have floundered? could she have floundered? could we have floundered? could you have floundered? could they have floundered?
V-ing perfect
could I have been floundering? could you have been floundering? could she have been floundering? could we have been floundering? could you have been floundering? could they have been floundering?
Interro-negative form
Simple form
couldn't I flounder? couldn't you flounder? couldn't she flounder? couldn't we flounder? couldn't you flounder? couldn't they flounder?
V-ing form
couldn't I be floundering? couldn't you be floundering? couldn't she be floundering? couldn't we be floundering? couldn't you be floundering? couldn't they be floundering?
Perfect
couldn't I have floundered? couldn't you have floundered? couldn't she have floundered? couldn't we have floundered? couldn't you have floundered? couldn't they have floundered?
V-ing perfect
couldn't I have been floundering? couldn't you have been floundering? couldn't she have been floundering? couldn't we have been floundering? couldn't you have been floundering? couldn't they have been floundering?