I could beg you could beg she could beg we could beg you could beg they could beg
V-ing form
I could be begging you could be begging she could be begging we could be begging you could be begging they could be begging
Perfect
I could have begged you could have begged she 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 she 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 she 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 she 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 she 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 she 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 she beg? could we beg? could you beg? could they beg?
V-ing form
could I be begging? could you be begging? could she be begging? could we be begging? could you be begging? could they be begging?
Perfect
could I have begged? could you have begged? could she 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 she 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 she 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 she 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 she 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 she have been begging? couldn't we have been begging? couldn't you have been begging? couldn't they have been begging?