Question

Fill in the blank with the most appropriate word.
He will study ____ .

• A. until I will come back
• B. when I came back
• C. when I will come back
• D. until I come back

Answer 1

The correct option is D until I come back

Let’s examine the sentence: “He will study ____ .” The use of ‘will’ indicates that the tense of the sentence is future. Hence, the part to come in blank cannot be of past tense. This rules out Option B as it uses a verb of past tense, i.e. ‘came.’ Until means 'up to the event mentioned.’ After until we use present tenses to talk about the future. This rules out Option A that uses ‘will’ with ‘until.’ "When" doesn't really refer to a specific time or period and, therefore, isn't an appropriate use of the word. This rules out Option C. We are left with Option D which is the correct answer.