Final answer:
The sentence 'Where were you?' is indeed an obligatory context for the uncontactable copula BE such as 'were' because it is the main verb and cannot be contracted.
Step-by-step explanation:
The statement that the sentence "Where were you?" contains an obligatory context for the uncontactable copula BE (am, are, is, was, were) is true. The sentence 'Where were you?' is indeed an obligatory context for the uncontractible copula BE such as 'were' because it is the main verb and cannot be contracted.
An obligatory context refers to a situation where the full form of the verb 'be' is required, rather than a contracted form. In the question 'Where were you?', 'were' is the main verb and cannot be contracted, which fits the pattern of an obligatory context for the copula BE where the sentence structure follows: (subject)+(be verb)+(adverbial of time or place).