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