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

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?