I could label you could label he could label we could label you could label they could label
V-ing form
I could be labelling you could be labelling he could be labelling we could be labelling you could be labelling they could be labelling
Perfect
I could have labelled you could have labelled he could have labelled we could have labelled you could have labelled they could have labelled
V-ing perfect
I could have been labelling you could have been labelling he could have been labelling we could have been labelling you could have been labelling they could have been labelling
Negation
Simple form
I couldn't label you couldn't label he couldn't label we couldn't label you couldn't label they couldn't label
V-ing form
I couldn't be labelling you couldn't be labelling he couldn't be labelling we couldn't be labelling you couldn't be labelling they couldn't be labelling
Perfect
I couldn't have labelled you couldn't have labelled he couldn't have labelled we couldn't have labelled you couldn't have labelled they couldn't have labelled
V-ing perfect
I couldn't have been labelling you couldn't have been labelling he couldn't have been labelling we couldn't have been labelling you couldn't have been labelling they couldn't have been labelling
Interrogative form
Simple form
could I label? could you label? could he label? could we label? could you label? could they label?
V-ing form
could I be labelling? could you be labelling? could he be labelling? could we be labelling? could you be labelling? could they be labelling?
Perfect
could I have labelled? could you have labelled? could he have labelled? could we have labelled? could you have labelled? could they have labelled?
V-ing perfect
could I have been labelling? could you have been labelling? could he have been labelling? could we have been labelling? could you have been labelling? could they have been labelling?
Interro-negative form
Simple form
couldn't I label? couldn't you label? couldn't he label? couldn't we label? couldn't you label? couldn't they label?
V-ing form
couldn't I be labelling? couldn't you be labelling? couldn't he be labelling? couldn't we be labelling? couldn't you be labelling? couldn't they be labelling?
Perfect
couldn't I have labelled? couldn't you have labelled? couldn't he have labelled? couldn't we have labelled? couldn't you have labelled? couldn't they have labelled?
V-ing perfect
couldn't I have been labelling? couldn't you have been labelling? couldn't he have been labelling? couldn't we have been labelling? couldn't you have been labelling? couldn't they have been labelling?