English verb conjugation
COULD FLIGHT-TEST

Regular verb: flight-test - flight-tested - flight-tested

Affirmation

Simple form	V-ing form
I could flight-test you could flight-test she could flight-test we could flight-test you could flight-test they could flight-test	I could be flight-testing you could be flight-testing she could be flight-testing we could be flight-testing you could be flight-testing they could be flight-testing
Perfect	V-ing perfect
I could have flight-tested you could have flight-tested she could have flight-tested we could have flight-tested you could have flight-tested they could have flight-tested	I could have been flight-testing you could have been flight-testing she could have been flight-testing we could have been flight-testing you could have been flight-testing they could have been flight-testing

Negation

Simple form	V-ing form
I couldn't flight-test you couldn't flight-test she couldn't flight-test we couldn't flight-test you couldn't flight-test they couldn't flight-test	I couldn't be flight-testing you couldn't be flight-testing she couldn't be flight-testing we couldn't be flight-testing you couldn't be flight-testing they couldn't be flight-testing
Perfect	V-ing perfect
I couldn't have flight-tested you couldn't have flight-tested she couldn't have flight-tested we couldn't have flight-tested you couldn't have flight-tested they couldn't have flight-tested	I couldn't have been flight-testing you couldn't have been flight-testing she couldn't have been flight-testing we couldn't have been flight-testing you couldn't have been flight-testing they couldn't have been flight-testing

Interrogative form

Simple form	V-ing form
could I flight-test? could you flight-test? could she flight-test? could we flight-test? could you flight-test? could they flight-test?	could I be flight-testing? could you be flight-testing? could she be flight-testing? could we be flight-testing? could you be flight-testing? could they be flight-testing?
Perfect	V-ing perfect
could I have flight-tested? could you have flight-tested? could she have flight-tested? could we have flight-tested? could you have flight-tested? could they have flight-tested?	could I have been flight-testing? could you have been flight-testing? could she have been flight-testing? could we have been flight-testing? could you have been flight-testing? could they have been flight-testing?

Interro-negative form

Simple form	V-ing form
couldn't I flight-test? couldn't you flight-test? couldn't she flight-test? couldn't we flight-test? couldn't you flight-test? couldn't they flight-test?	couldn't I be flight-testing? couldn't you be flight-testing? couldn't she be flight-testing? couldn't we be flight-testing? couldn't you be flight-testing? couldn't they be flight-testing?
Perfect	V-ing perfect
couldn't I have flight-tested? couldn't you have flight-tested? couldn't she have flight-tested? couldn't we have flight-tested? couldn't you have flight-tested? couldn't they have flight-tested?	couldn't I have been flight-testing? couldn't you have been flight-testing? couldn't she have been flight-testing? couldn't we have been flight-testing? couldn't you have been flight-testing? couldn't they have been flight-testing?