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