-  ‘by day’ in place of ‘by a day’

This sentence talks about the natural law that governs the sun's shining pattern. The sentence can be broken down into four parts as follows:

Part (1): "The sun shines" - This is a complete and grammatically correct sentence. It is in the present tense and the subject ("the sun") is doing the action ("shines").

Part (2): "by a day always" - This part is incorrect. The article "a" is not needed before "day". Instead, the correct phrasing would be "by day always". This means that the sun always shines during the day.

Part (3): "not by night, because" - This part is correct. It means that the sun does not shine at night, and the reason for this is given in the next part.

Part (4): "it is the law of nature" - This part is also correct. It means that the sun's shining pattern is a natural law, which is why it does not shine at night.

In summary, the sentence should be corrected to read "The sun shines by day always" by removing the article "a" before "day" in part (2). The corrected sentence is grammatically correct and conveys the intended meaning of the sentence.

Formulae and Definitions:

1. Subject: The subject is the noun or pronoun that performs the action in a sentence.
2. Verb: The verb is the action word in a sentence.
3. Article: An article is a type of determiner that is used to indicate whether a noun is specific or general. There are two types of articles: definite (the) and indefinite (a/an).
4. Natural Law: A natural law is a fundamental principle that is believed to govern the behavior of the universe. It is often used to describe scientific phenomena that are observed to occur consistently over time.
5. Present Tense: The present tense is a verb form that is used to describe actions that are happening now or that occur regularly.

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