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