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