To tie down the thing that is on the top of the car because it won’t slide off
That sentence is an example of parallel structure.
When there is repetition of a specific grammatical form in a sentence, parallelism or a parallel structure is produced. This occurs when you mantain the same pattern for every compared word or idea in your construction. This makes the idea easier to follow by the reader.
All you have to do is restate your topic sentence but in a different way and make your point more clear.
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Explanation: