I could simplify you could simplify he could simplify we could simplify you could simplify they could simplify
V-ing form
I could be simplifying you could be simplifying he could be simplifying we could be simplifying you could be simplifying they could be simplifying
Perfect
I could have simplified you could have simplified he could have simplified we could have simplified you could have simplified they could have simplified
V-ing perfect
I could have been simplifying you could have been simplifying he could have been simplifying we could have been simplifying you could have been simplifying they could have been simplifying
Negation
Simple form
I could not simplify you could not simplify he could not simplify we could not simplify you could not simplify they could not simplify
V-ing form
I could not be simplifying you could not be simplifying he could not be simplifying we could not be simplifying you could not be simplifying they could not be simplifying
Perfect
I could not have simplified you could not have simplified he could not have simplified we could not have simplified you could not have simplified they could not have simplified
V-ing perfect
I could not have been simplifying you could not have been simplifying he could not have been simplifying we could not have been simplifying you could not have been simplifying they could not have been simplifying
Interrogative form
Simple form
could I simplify? could you simplify? could he simplify? could we simplify? could you simplify? could they simplify?
V-ing form
could I be simplifying? could you be simplifying? could he be simplifying? could we be simplifying? could you be simplifying? could they be simplifying?
Perfect
could I have simplified? could you have simplified? could he have simplified? could we have simplified? could you have simplified? could they have simplified?
V-ing perfect
could I have been simplifying? could you have been simplifying? could he have been simplifying? could we have been simplifying? could you have been simplifying? could they have been simplifying?
Interro-negative form
Simple form
could I not simplify? could you not simplify? could he not simplify? could we not simplify? could you not simplify? could they not simplify?
V-ing form
could I not be simplifying? could you not be simplifying? could he not be simplifying? could we not be simplifying? could you not be simplifying? could they not be simplifying?
Perfect
could I not have simplified? could you not have simplified? could he not have simplified? could we not have simplified? could you not have simplified? could they not have simplified?
V-ing perfect
could I not have been simplifying? could you not have been simplifying? could he not have been simplifying? could we not have been simplifying? could you not have been simplifying? could they not have been simplifying?