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