I could interrogate you could interrogate he could interrogate we could interrogate you could interrogate they could interrogate
V-ing form
I could be interrogating you could be interrogating he could be interrogating we could be interrogating you could be interrogating they could be interrogating
Perfect
I could have interrogated you could have interrogated he could have interrogated we could have interrogated you could have interrogated they could have interrogated
V-ing perfect
I could have been interrogating you could have been interrogating he could have been interrogating we could have been interrogating you could have been interrogating they could have been interrogating
Negation
Simple form
I could not interrogate you could not interrogate he could not interrogate we could not interrogate you could not interrogate they could not interrogate
V-ing form
I could not be interrogating you could not be interrogating he could not be interrogating we could not be interrogating you could not be interrogating they could not be interrogating
Perfect
I could not have interrogated you could not have interrogated he could not have interrogated we could not have interrogated you could not have interrogated they could not have interrogated
V-ing perfect
I could not have been interrogating you could not have been interrogating he could not have been interrogating we could not have been interrogating you could not have been interrogating they could not have been interrogating
Interrogative form
Simple form
could I interrogate? could you interrogate? could he interrogate? could we interrogate? could you interrogate? could they interrogate?
V-ing form
could I be interrogating? could you be interrogating? could he be interrogating? could we be interrogating? could you be interrogating? could they be interrogating?
Perfect
could I have interrogated? could you have interrogated? could he have interrogated? could we have interrogated? could you have interrogated? could they have interrogated?
V-ing perfect
could I have been interrogating? could you have been interrogating? could he have been interrogating? could we have been interrogating? could you have been interrogating? could they have been interrogating?
Interro-negative form
Simple form
could I not interrogate? could you not interrogate? could he not interrogate? could we not interrogate? could you not interrogate? could they not interrogate?
V-ing form
could I not be interrogating? could you not be interrogating? could he not be interrogating? could we not be interrogating? could you not be interrogating? could they not be interrogating?
Perfect
could I not have interrogated? could you not have interrogated? could he not have interrogated? could we not have interrogated? could you not have interrogated? could they not have interrogated?
V-ing perfect
could I not have been interrogating? could you not have been interrogating? could he not have been interrogating? could we not have been interrogating? could you not have been interrogating? could they not have been interrogating?