I could screen-test you could screen-test he could screen-test we could screen-test you could screen-test they could screen-test
V-ing form
I could be screen-testing you could be screen-testing he could be screen-testing we could be screen-testing you could be screen-testing they could be screen-testing
Perfect
I could have screen-tested you could have screen-tested he could have screen-tested we could have screen-tested you could have screen-tested they could have screen-tested
V-ing perfect
I could have been screen-testing you could have been screen-testing he could have been screen-testing we could have been screen-testing you could have been screen-testing they could have been screen-testing
Negation
Simple form
I couldn't screen-test you couldn't screen-test he couldn't screen-test we couldn't screen-test you couldn't screen-test they couldn't screen-test
V-ing form
I couldn't be screen-testing you couldn't be screen-testing he couldn't be screen-testing we couldn't be screen-testing you couldn't be screen-testing they couldn't be screen-testing
Perfect
I couldn't have screen-tested you couldn't have screen-tested he couldn't have screen-tested we couldn't have screen-tested you couldn't have screen-tested they couldn't have screen-tested
V-ing perfect
I couldn't have been screen-testing you couldn't have been screen-testing he couldn't have been screen-testing we couldn't have been screen-testing you couldn't have been screen-testing they couldn't have been screen-testing
Interrogative form
Simple form
could I screen-test? could you screen-test? could he screen-test? could we screen-test? could you screen-test? could they screen-test?
V-ing form
could I be screen-testing? could you be screen-testing? could he be screen-testing? could we be screen-testing? could you be screen-testing? could they be screen-testing?
Perfect
could I have screen-tested? could you have screen-tested? could he have screen-tested? could we have screen-tested? could you have screen-tested? could they have screen-tested?
V-ing perfect
could I have been screen-testing? could you have been screen-testing? could he have been screen-testing? could we have been screen-testing? could you have been screen-testing? could they have been screen-testing?
Interro-negative form
Simple form
couldn't I screen-test? couldn't you screen-test? couldn't he screen-test? couldn't we screen-test? couldn't you screen-test? couldn't they screen-test?
V-ing form
couldn't I be screen-testing? couldn't you be screen-testing? couldn't he be screen-testing? couldn't we be screen-testing? couldn't you be screen-testing? couldn't they be screen-testing?
Perfect
couldn't I have screen-tested? couldn't you have screen-tested? couldn't he have screen-tested? couldn't we have screen-tested? couldn't you have screen-tested? couldn't they have screen-tested?
V-ing perfect
couldn't I have been screen-testing? couldn't you have been screen-testing? couldn't he have been screen-testing? couldn't we have been screen-testing? couldn't you have been screen-testing? couldn't they have been screen-testing?