I could prerequire you could prerequire she could prerequire we could prerequire you could prerequire they could prerequire
V-ing form
I could be prerequiring you could be prerequiring she could be prerequiring we could be prerequiring you could be prerequiring they could be prerequiring
Perfect
I could have prerequired you could have prerequired she 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 she 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 she 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 she 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 she 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 she 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 she prerequire? could we prerequire? could you prerequire? could they prerequire?
V-ing form
could I be prerequiring? could you be prerequiring? could she be prerequiring? could we be prerequiring? could you be prerequiring? could they be prerequiring?
Perfect
could I have prerequired? could you have prerequired? could she 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 she 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 she 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 she 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 she 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 she have been prerequiring? couldn't we have been prerequiring? couldn't you have been prerequiring? couldn't they have been prerequiring?