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