Who did go to Moscow 2 years ago?
How much years ago he went to Moscow?
Where did he go 2 years ago?
He went to Moscow or he will go to Moscow?
Did he go to Moscow 2 years ago?
1 helped
2 had told, would have helped (почему-то такого варианта я у вас не увидела, может просто ошиблись? но именно этот вариант правильный. Это условное предложение 3 типа, нереальное. Переводится так: Если бы вы мне вчера об этом сказали, я бы вам помог)
His wife Anna Petrovna could not work at the plant or at an office because the had three children. She had to look after them.
His wife Anna Petrovna can not work at the plant or at an office because the has three children. She has to look after them.His wife Anna Petrovna will not be able to work at the plant or at an office because the will have three children. She will not be able to look after them.