I could prevaricate you could prevaricate she could prevaricate we could prevaricate you could prevaricate they could prevaricate
V-ing form
I could be prevaricating you could be prevaricating she could be prevaricating we could be prevaricating you could be prevaricating they could be prevaricating
Perfect
I could have prevaricated you could have prevaricated she could have prevaricated we could have prevaricated you could have prevaricated they could have prevaricated
V-ing perfect
I could have been prevaricating you could have been prevaricating she could have been prevaricating we could have been prevaricating you could have been prevaricating they could have been prevaricating
Negation
Simple form
I couldn't prevaricate you couldn't prevaricate she couldn't prevaricate we couldn't prevaricate you couldn't prevaricate they couldn't prevaricate
V-ing form
I couldn't be prevaricating you couldn't be prevaricating she couldn't be prevaricating we couldn't be prevaricating you couldn't be prevaricating they couldn't be prevaricating
Perfect
I couldn't have prevaricated you couldn't have prevaricated she couldn't have prevaricated we couldn't have prevaricated you couldn't have prevaricated they couldn't have prevaricated
V-ing perfect
I couldn't have been prevaricating you couldn't have been prevaricating she couldn't have been prevaricating we couldn't have been prevaricating you couldn't have been prevaricating they couldn't have been prevaricating
Interrogative form
Simple form
could I prevaricate? could you prevaricate? could she prevaricate? could we prevaricate? could you prevaricate? could they prevaricate?
V-ing form
could I be prevaricating? could you be prevaricating? could she be prevaricating? could we be prevaricating? could you be prevaricating? could they be prevaricating?
Perfect
could I have prevaricated? could you have prevaricated? could she have prevaricated? could we have prevaricated? could you have prevaricated? could they have prevaricated?
V-ing perfect
could I have been prevaricating? could you have been prevaricating? could she have been prevaricating? could we have been prevaricating? could you have been prevaricating? could they have been prevaricating?
Interro-negative form
Simple form
couldn't I prevaricate? couldn't you prevaricate? couldn't she prevaricate? couldn't we prevaricate? couldn't you prevaricate? couldn't they prevaricate?
V-ing form
couldn't I be prevaricating? couldn't you be prevaricating? couldn't she be prevaricating? couldn't we be prevaricating? couldn't you be prevaricating? couldn't they be prevaricating?
Perfect
couldn't I have prevaricated? couldn't you have prevaricated? couldn't she have prevaricated? couldn't we have prevaricated? couldn't you have prevaricated? couldn't they have prevaricated?
V-ing perfect
couldn't I have been prevaricating? couldn't you have been prevaricating? couldn't she have been prevaricating? couldn't we have been prevaricating? couldn't you have been prevaricating? couldn't they have been prevaricating?