我知道篝火晚会那里一定有备用木柴，Bob 说过营地物资充足。
I knew there had to be spare firewood somewhere; Bob said the campsite was well-stocked.
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there英 /ðeə/|美 /ðɛr/
had英 /hæd/|美 /hæd/
to英 /tuː/|美 /tu/|英 /tə/|美 /tə/
Be英 /biː/|美 /bi/
解释
had to 表示过去的客观必要性；there had to be 在 there be 存在句中加入过去式半情态动词，表达"过去必定存在"的推断。
I knew there had to be spare firewood somewhere; Bob said the campsite was well-stocked.
had to 表示过去的客观必要性；there had to be 在 there be 存在句中加入过去式半情态动词，表达"过去必定存在"的推断。