Question

Fill in the blanks with the most suitable option:
I'm sorry you are leaving. I __________ when you _________.

• A. am glad / you are back
• B. glad / will be back
• C. will be glad / are back
• D. am glad / will be back

Answer 1

Answer: (C)

will be glad / are back

Answer : C

Important thing to determine the sequence of tenses in a sentence is to know that it is arranged in the order is Past --> Present --> Future, just as it happens in real life. Therefore, it is important to determine the occurrence of each action relative to each other.

Reading the sentences in the question we understand that the speaker is sorry that the person, whom he is speaking to, is leaving. And that the speaker would be happy to see when that person returns.

Grammar Rule Required to know here:

If the principal clause is in future tense, subordinate clause is introduced by the conjunction like "when". "When" is a temporal conjunction and would signify that the second action actually happened before the other action.

Therefore, in the question the first blank will be in future tense ("will be glad"), and the second blank will be in the simple present tense ("are back").

Thus, the correct complete sentence is:

I WILL BE GLAD when you ARE BACK.