being用作谓语动词构成被动语态时例句：Hesaidresourcesfromfamiliesandcommunitieshostingthedisplacedarebeingstretchedtothelimit.这句话同Hesaidresourcesfromfamiliesandcommunitieshostingthedisplacedarestretch

　　being用作谓语动词构成被动语态时

　　例句：Hesaidresourcesfromfamiliesandcommunitieshostingthedisplacedarebeingstretchedtothelimit.这句话同Hesaidresourcesfromfamiliesandcommunitieshostingthedisplacedarestretchedtothelimit.在句义理解上怎么区分?