I could amplify you could amplify he could amplify we could amplify you could amplify they could amplify
V-ing form
I could be amplifying you could be amplifying he could be amplifying we could be amplifying you could be amplifying they could be amplifying
Perfect
I could have amplified you could have amplified he could have amplified we could have amplified you could have amplified they could have amplified
V-ing perfect
I could have been amplifying you could have been amplifying he could have been amplifying we could have been amplifying you could have been amplifying they could have been amplifying
Negation
Simple form
I could not amplify you could not amplify he could not amplify we could not amplify you could not amplify they could not amplify
V-ing form
I could not be amplifying you could not be amplifying he could not be amplifying we could not be amplifying you could not be amplifying they could not be amplifying
Perfect
I could not have amplified you could not have amplified he could not have amplified we could not have amplified you could not have amplified they could not have amplified
V-ing perfect
I could not have been amplifying you could not have been amplifying he could not have been amplifying we could not have been amplifying you could not have been amplifying they could not have been amplifying
Interrogative form
Simple form
could I amplify? could you amplify? could he amplify? could we amplify? could you amplify? could they amplify?
V-ing form
could I be amplifying? could you be amplifying? could he be amplifying? could we be amplifying? could you be amplifying? could they be amplifying?
Perfect
could I have amplified? could you have amplified? could he have amplified? could we have amplified? could you have amplified? could they have amplified?
V-ing perfect
could I have been amplifying? could you have been amplifying? could he have been amplifying? could we have been amplifying? could you have been amplifying? could they have been amplifying?
Interro-negative form
Simple form
could I not amplify? could you not amplify? could he not amplify? could we not amplify? could you not amplify? could they not amplify?
V-ing form
could I not be amplifying? could you not be amplifying? could he not be amplifying? could we not be amplifying? could you not be amplifying? could they not be amplifying?
Perfect
could I not have amplified? could you not have amplified? could he not have amplified? could we not have amplified? could you not have amplified? could they not have amplified?
V-ing perfect
could I not have been amplifying? could you not have been amplifying? could he not have been amplifying? could we not have been amplifying? could you not have been amplifying? could they not have been amplifying?