Open the brackets, put the verb in the correct form in sentence: "(To be) ... you able to sing when you were young?"

The correct form of the verb "to be" in this sentence is "Were". Here's why: The sentence refers to a past ability ("when you were young"). Therefore, we need to use the past tense of "to be". The past tense forms of "to be" are "was" and "were". "Was" is used for singular subjects (I, he, she, it), and "were" is used for plural subjects (we, you, they) and also with "you" in the singular form. In this case, the subject is "you", so the correct form is "were". Answer: Were