Он, должно быть, гостит у своих дру

Он, должно быть, гостит у своих друзей на Мальте, так как писал, что обычно проводит свой отпуск у них.

Результаты (английский) 1:

He must be staying with friends in Malta, as wrote that typically spends his vacation with them.

Результаты (английский) 2:

He must have been staying with his friends in Malta, as he wrote, that usually spends his vacation with them.

Результаты (английский) 3:

he must be with your friends in malta, as written, usually spends his vacation with them.