Вашему другу давно следовало бы пой

Вашему другу давно следовало бы пойти к врачу. Если бы он прошел курс лечения, он бы уже выздоровел.

Результаты (английский) 1:

Your friend long ago should have gone to the doctor. If he was treated, he would have already recovered.

Результаты (английский) 2:

Your friend for a long time should go to the doctor. If he was treated, he would have recovered.

Результаты (английский) 3:

Your friend should have been to go to the doctor. If he had received medical treatment, he would have already been recovered.