Final answer:
The tense in the sentence "We have been waiting for them." is Present Perfect Tense.
Step-by-step explanation:
The tense in the sentence "We have been waiting for them." is Present Perfect Tense. This tense is typically used to indicate an action that started in the past and continues up to the present moment. In this sentence, the verb "have been waiting" shows that the waiting started in the past and is still ongoing.
Learn more about tense identification