Question

Complete the sentences in past perfect simple and change the verbs in the bracket to the correct form: Uncle Felix could not send a postcard because he _____ (lose) my address​

Answer 1

Uncle Felix could not send a postcard because he *had lost* (lose) my address

Answer 2

Uncle Felix could not send a postcard because he had lost my address.

In this sentence, we use the past perfect simple tense to indicate that the action of losing the address happened before the action of not being able to send a postcard. The correct form of the verb "lose" in the past perfect simple tense is "had lost".