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