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