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