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