Question

The helicopter landed on blank roof of a building

Answer 1

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The helicopter land on the roof of a building.

Answer 2

Correct the usage of Articles in the sentence: ('the, a')  - The helicopter landed on the roof of a building.

Explanation:

• Article 'The' is used in front of singular or plural nouns and adjectives.
• It is used to refer something in which both the speaker and listener are familiar.  
• For example, if you are playing a basketball at school, your friend can say, "Give me the ball."
• Article 'a' is used when you are not necessarily referring to a specific thing (such as a nail, any nail).

Learn more:

1) What is articles in grammar​:

https://brainly.in/question/11463075

2) How many articles are in English grammar:

https://brainly.in/question/11438933