Her family was Jewish so they had to hide or they would be caught by the German Nazis.

Her family was Jewish so they had to hide or they would be caught by the German Nazis.
Her family was Jewish so they had to hide or they would be caught by the German Nazis.

Her family was Jewish so they had to hide or they would be caught by the German Nazis.
她是犹太人,所以他们不得不隐藏他们将被德国纳粹

or用在虚拟语气中，表示“否则，要不然"，还有”otherwise“，引导含蓄条件句。