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