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