I could quantify you could quantify she could quantify we could quantify you could quantify they could quantify
V-ing form
I could be quantifying you could be quantifying she could be quantifying we could be quantifying you could be quantifying they could be quantifying
Perfect
I could have quantified you could have quantified she could have quantified we could have quantified you could have quantified they could have quantified
V-ing perfect
I could have been quantifying you could have been quantifying she could have been quantifying we could have been quantifying you could have been quantifying they could have been quantifying
Negation
Simple form
I could not quantify you could not quantify she could not quantify we could not quantify you could not quantify they could not quantify
V-ing form
I could not be quantifying you could not be quantifying she could not be quantifying we could not be quantifying you could not be quantifying they could not be quantifying
Perfect
I could not have quantified you could not have quantified she could not have quantified we could not have quantified you could not have quantified they could not have quantified
V-ing perfect
I could not have been quantifying you could not have been quantifying she could not have been quantifying we could not have been quantifying you could not have been quantifying they could not have been quantifying
Interrogative form
Simple form
could I quantify? could you quantify? could she quantify? could we quantify? could you quantify? could they quantify?
V-ing form
could I be quantifying? could you be quantifying? could she be quantifying? could we be quantifying? could you be quantifying? could they be quantifying?
Perfect
could I have quantified? could you have quantified? could she have quantified? could we have quantified? could you have quantified? could they have quantified?
V-ing perfect
could I have been quantifying? could you have been quantifying? could she have been quantifying? could we have been quantifying? could you have been quantifying? could they have been quantifying?
Interro-negative form
Simple form
could I not quantify? could you not quantify? could she not quantify? could we not quantify? could you not quantify? could they not quantify?
V-ing form
could I not be quantifying? could you not be quantifying? could she not be quantifying? could we not be quantifying? could you not be quantifying? could they not be quantifying?
Perfect
could I not have quantified? could you not have quantified? could she not have quantified? could we not have quantified? could you not have quantified? could they not have quantified?
V-ing perfect
could I not have been quantifying? could you not have been quantifying? could she not have been quantifying? could we not have been quantifying? could you not have been quantifying? could they not have been quantifying?