Question

By the time she returned he typed all letters.​

Answer 1

Answer:

“By the time she returned, he typed all letters.” In this question where should we include had and why?

Answer:

Since the dependent clause, in the past tense, specifies a time that relates it to the verb in the main clause, also in the past, the word “had” should appear after “he,” as in “By the time she returned, he had typed all the letters,” putting the main clause in the past perfect tense.

Explanation:

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Answer 2

Answer:

By the time she returned he had typed all letters