I could discredit you could discredit he could discredit we could discredit you could discredit they could discredit
V-ing form
I could be discrediting you could be discrediting he could be discrediting we could be discrediting you could be discrediting they could be discrediting
Perfect
I could have discredited you could have discredited he 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 he 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 he 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 he 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 he 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 he 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 he discredit? could we discredit? could you discredit? could they discredit?
V-ing form
could I be discrediting? could you be discrediting? could he be discrediting? could we be discrediting? could you be discrediting? could they be discrediting?
Perfect
could I have discredited? could you have discredited? could he 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 he 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 he 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 he 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 he 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 he have been discrediting? couldn't we have been discrediting? couldn't you have been discrediting? couldn't they have been discrediting?