-  by scooter in place of by a scooter

The given sentence is:

Mr. Gupta leads a very busy life so he goes everywhere by a scooter.

The sentence is grammatically incorrect because of the use of the article "a" before "scooter". Here, the word "scooter" is a countable noun, and it refers to a specific object. So, the use of the article "a" is incorrect.

We can correct the sentence by using the appropriate article "the" instead of "a". The corrected sentence would be:

Mr. Gupta leads a very busy life so he goes everywhere by the scooter

Therefore, the error is in part (4), and the correct option is D.

Formula:

• Countable nouns refer to things that can be counted and have a plural form.

Key Points:

• The given sentence is grammatically incorrect because of the use of the article "a" before "scooter".
• The use of the article "a" is incorrect because "scooter" is a countable noun, and it refers to a specific object.
• The correct article to be used in this case is "the".

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