Question

(iv) I __________ (write) a letter after half an hour.​

Answer 1

I will write a letter after half an hour.

Answer 2

will write

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Why we are using will write?

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Will refers to future

types of future tense

1) Will

2) would

3) shall

4) should

To mention future, we will use these words.

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Since will is apt for this place, the answer will be will write.

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THIS IS THE REQUIRED ANSWER