I could audit you could audit he could audit we could audit you could audit they could audit
V-ing form
I could be auditing you could be auditing he could be auditing we could be auditing you could be auditing they could be auditing
Perfect
I could have audited you could have audited he could have audited we could have audited you could have audited they could have audited
V-ing perfect
I could have been auditing you could have been auditing he could have been auditing we could have been auditing you could have been auditing they could have been auditing
Negation
Simple form
I couldn't audit you couldn't audit he couldn't audit we couldn't audit you couldn't audit they couldn't audit
V-ing form
I couldn't be auditing you couldn't be auditing he couldn't be auditing we couldn't be auditing you couldn't be auditing they couldn't be auditing
Perfect
I couldn't have audited you couldn't have audited he couldn't have audited we couldn't have audited you couldn't have audited they couldn't have audited
V-ing perfect
I couldn't have been auditing you couldn't have been auditing he couldn't have been auditing we couldn't have been auditing you couldn't have been auditing they couldn't have been auditing
Interrogative form
Simple form
could I audit? could you audit? could he audit? could we audit? could you audit? could they audit?
V-ing form
could I be auditing? could you be auditing? could he be auditing? could we be auditing? could you be auditing? could they be auditing?
Perfect
could I have audited? could you have audited? could he have audited? could we have audited? could you have audited? could they have audited?
V-ing perfect
could I have been auditing? could you have been auditing? could he have been auditing? could we have been auditing? could you have been auditing? could they have been auditing?
Interro-negative form
Simple form
couldn't I audit? couldn't you audit? couldn't he audit? couldn't we audit? couldn't you audit? couldn't they audit?
V-ing form
couldn't I be auditing? couldn't you be auditing? couldn't he be auditing? couldn't we be auditing? couldn't you be auditing? couldn't they be auditing?
Perfect
couldn't I have audited? couldn't you have audited? couldn't he have audited? couldn't we have audited? couldn't you have audited? couldn't they have audited?
V-ing perfect
couldn't I have been auditing? couldn't you have been auditing? couldn't he have been auditing? couldn't we have been auditing? couldn't you have been auditing? couldn't they have been auditing?