I could bioassay you could bioassay she could bioassay we could bioassay you could bioassay they could bioassay
V-ing form
I could be bioassaying you could be bioassaying she could be bioassaying we could be bioassaying you could be bioassaying they could be bioassaying
Perfect
I could have bioassayed you could have bioassayed she could have bioassayed we could have bioassayed you could have bioassayed they could have bioassayed
V-ing perfect
I could have been bioassaying you could have been bioassaying she could have been bioassaying we could have been bioassaying you could have been bioassaying they could have been bioassaying
Negation
Simple form
I couldn't bioassay you couldn't bioassay she couldn't bioassay we couldn't bioassay you couldn't bioassay they couldn't bioassay
V-ing form
I couldn't be bioassaying you couldn't be bioassaying she couldn't be bioassaying we couldn't be bioassaying you couldn't be bioassaying they couldn't be bioassaying
Perfect
I couldn't have bioassayed you couldn't have bioassayed she couldn't have bioassayed we couldn't have bioassayed you couldn't have bioassayed they couldn't have bioassayed
V-ing perfect
I couldn't have been bioassaying you couldn't have been bioassaying she couldn't have been bioassaying we couldn't have been bioassaying you couldn't have been bioassaying they couldn't have been bioassaying
Interrogative form
Simple form
could I bioassay? could you bioassay? could she bioassay? could we bioassay? could you bioassay? could they bioassay?
V-ing form
could I be bioassaying? could you be bioassaying? could she be bioassaying? could we be bioassaying? could you be bioassaying? could they be bioassaying?
Perfect
could I have bioassayed? could you have bioassayed? could she have bioassayed? could we have bioassayed? could you have bioassayed? could they have bioassayed?
V-ing perfect
could I have been bioassaying? could you have been bioassaying? could she have been bioassaying? could we have been bioassaying? could you have been bioassaying? could they have been bioassaying?
Interro-negative form
Simple form
couldn't I bioassay? couldn't you bioassay? couldn't she bioassay? couldn't we bioassay? couldn't you bioassay? couldn't they bioassay?
V-ing form
couldn't I be bioassaying? couldn't you be bioassaying? couldn't she be bioassaying? couldn't we be bioassaying? couldn't you be bioassaying? couldn't they be bioassaying?
Perfect
couldn't I have bioassayed? couldn't you have bioassayed? couldn't she have bioassayed? couldn't we have bioassayed? couldn't you have bioassayed? couldn't they have bioassayed?
V-ing perfect
couldn't I have been bioassaying? couldn't you have been bioassaying? couldn't she have been bioassaying? couldn't we have been bioassaying? couldn't you have been bioassaying? couldn't they have been bioassaying?