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