I could instrument you could instrument he could instrument we could instrument you could instrument they could instrument
V-ing form
I could be instrumenting you could be instrumenting he could be instrumenting we could be instrumenting you could be instrumenting they could be instrumenting
Perfect
I could have instrumented you could have instrumented he could have instrumented we could have instrumented you could have instrumented they could have instrumented
V-ing perfect
I could have been instrumenting you could have been instrumenting he could have been instrumenting we could have been instrumenting you could have been instrumenting they could have been instrumenting
Negation
Simple form
I could not instrument you could not instrument he could not instrument we could not instrument you could not instrument they could not instrument
V-ing form
I could not be instrumenting you could not be instrumenting he could not be instrumenting we could not be instrumenting you could not be instrumenting they could not be instrumenting
Perfect
I could not have instrumented you could not have instrumented he could not have instrumented we could not have instrumented you could not have instrumented they could not have instrumented
V-ing perfect
I could not have been instrumenting you could not have been instrumenting he could not have been instrumenting we could not have been instrumenting you could not have been instrumenting they could not have been instrumenting
Interrogative form
Simple form
could I instrument? could you instrument? could he instrument? could we instrument? could you instrument? could they instrument?
V-ing form
could I be instrumenting? could you be instrumenting? could he be instrumenting? could we be instrumenting? could you be instrumenting? could they be instrumenting?
Perfect
could I have instrumented? could you have instrumented? could he have instrumented? could we have instrumented? could you have instrumented? could they have instrumented?
V-ing perfect
could I have been instrumenting? could you have been instrumenting? could he have been instrumenting? could we have been instrumenting? could you have been instrumenting? could they have been instrumenting?
Interro-negative form
Simple form
could I not instrument? could you not instrument? could he not instrument? could we not instrument? could you not instrument? could they not instrument?
V-ing form
could I not be instrumenting? could you not be instrumenting? could he not be instrumenting? could we not be instrumenting? could you not be instrumenting? could they not be instrumenting?
Perfect
could I not have instrumented? could you not have instrumented? could he not have instrumented? could we not have instrumented? could you not have instrumented? could they not have instrumented?
V-ing perfect
could I not have been instrumenting? could you not have been instrumenting? could he not have been instrumenting? could we not have been instrumenting? could you not have been instrumenting? could they not have been instrumenting?