I could mutate you could mutate she could mutate we could mutate you could mutate they could mutate
V-ing form
I could be mutating you could be mutating she could be mutating we could be mutating you could be mutating they could be mutating
Perfect
I could have mutated you could have mutated she 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 she 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 she 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 she 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 she 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 she 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 she mutate? could we mutate? could you mutate? could they mutate?
V-ing form
could I be mutating? could you be mutating? could she be mutating? could we be mutating? could you be mutating? could they be mutating?
Perfect
could I have mutated? could you have mutated? could she 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 she 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 she 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 she 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 she 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 she have been mutating? couldn't we have been mutating? couldn't you have been mutating? couldn't they have been mutating?