I could contradistinguish you could contradistinguish he could contradistinguish we could contradistinguish you could contradistinguish they could contradistinguish
V-ing form
I could be contradistinguishing you could be contradistinguishing he could be contradistinguishing we could be contradistinguishing you could be contradistinguishing they could be contradistinguishing
Perfect
I could have contradistinguished you could have contradistinguished he could have contradistinguished we could have contradistinguished you could have contradistinguished they could have contradistinguished
V-ing perfect
I could have been contradistinguishing you could have been contradistinguishing he could have been contradistinguishing we could have been contradistinguishing you could have been contradistinguishing they could have been contradistinguishing
Negation
Simple form
I couldn't contradistinguish you couldn't contradistinguish he couldn't contradistinguish we couldn't contradistinguish you couldn't contradistinguish they couldn't contradistinguish
V-ing form
I couldn't be contradistinguishing you couldn't be contradistinguishing he couldn't be contradistinguishing we couldn't be contradistinguishing you couldn't be contradistinguishing they couldn't be contradistinguishing
Perfect
I couldn't have contradistinguished you couldn't have contradistinguished he couldn't have contradistinguished we couldn't have contradistinguished you couldn't have contradistinguished they couldn't have contradistinguished
V-ing perfect
I couldn't have been contradistinguishing you couldn't have been contradistinguishing he couldn't have been contradistinguishing we couldn't have been contradistinguishing you couldn't have been contradistinguishing they couldn't have been contradistinguishing
Interrogative form
Simple form
could I contradistinguish? could you contradistinguish? could he contradistinguish? could we contradistinguish? could you contradistinguish? could they contradistinguish?
V-ing form
could I be contradistinguishing? could you be contradistinguishing? could he be contradistinguishing? could we be contradistinguishing? could you be contradistinguishing? could they be contradistinguishing?
Perfect
could I have contradistinguished? could you have contradistinguished? could he have contradistinguished? could we have contradistinguished? could you have contradistinguished? could they have contradistinguished?
V-ing perfect
could I have been contradistinguishing? could you have been contradistinguishing? could he have been contradistinguishing? could we have been contradistinguishing? could you have been contradistinguishing? could they have been contradistinguishing?
Interro-negative form
Simple form
couldn't I contradistinguish? couldn't you contradistinguish? couldn't he contradistinguish? couldn't we contradistinguish? couldn't you contradistinguish? couldn't they contradistinguish?
V-ing form
couldn't I be contradistinguishing? couldn't you be contradistinguishing? couldn't he be contradistinguishing? couldn't we be contradistinguishing? couldn't you be contradistinguishing? couldn't they be contradistinguishing?
Perfect
couldn't I have contradistinguished? couldn't you have contradistinguished? couldn't he have contradistinguished? couldn't we have contradistinguished? couldn't you have contradistinguished? couldn't they have contradistinguished?
V-ing perfect
couldn't I have been contradistinguishing? couldn't you have been contradistinguishing? couldn't he have been contradistinguishing? couldn't we have been contradistinguishing? couldn't you have been contradistinguishing? couldn't they have been contradistinguishing?