Как это вы умудрились потерять книг

Как это вы умудрились потерять книгу? Вы должны были положить ее в портфель, тогда вы бы ее не потеряли. Теперь вам придется расстаться с какой-нибудь из своих книг.

Результаты (английский) 1:

How is it you have managed to lose the book? You should have put it in the portfolio, then you would not have lost. Now you'll have to part with any of his books.

Результаты (английский) 2:

How did you manage to lose a book? You had to put it in the bag, then you would not have lost it. Now you'll have to part with some of his books.

Результаты (английский) 3:

how did you manage to lose a book? you should have put it in the bag, then you wouldn't have lost. now you have to give up some of your books.