Question

1-The birds away a before winter comes. [Future perfect tense of take]
2-Mohit climbs the tree. [Present perfect continuous tense]
3-Grand mother is just writing a letter. [Present perfect tense]
4-The plane (fly) twice speed of sound. [Simple present tense]
5-When I reached the airport he was departing. [Past perfect tense]
6-Tina participates in the concert. [Simple future tense]
7-Leela will purchase diamond necklace tomorrow. [Simple past tense]
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Answer 1

Answer:

2.Mohit has been climbing the tree.

3. Grandmother has written a letter.

4.The plane flies twice speed of sound.

5.when i reached the airport he had departed.

6.Tina will participate in the concert.

7.Leela purchased diamond necklace yesterday.