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