Test preparation

Yes, the Preposition can be used at the end of sentence if the object is interrogative or relative pronoun. The examples of the same are shared below:

• Preposition at the end in case on relative pronoun: Here is the file that you asked for.
• Preposition at the end in case on interrogative pronoun: What are you looking at?

Prepositions are the words which are used before the objects (nouns or pronouns). Preposition words connect nouns and pronouns with other parts of the sentence. Some of the examples of Prepositions are:

• He cleaned the shelf with a piece of cloth.
• I rushed into the room after seeing lizard.
• He sacrificed his life for his country.

In the above examples, with, into and for words are prepositions.

Composition or English Composition is the process and art of writing. It broadly refers to all kinds of writing including essays, reports, research papers, letters, stories, etc. 

The English Composition is broadly classified into four types, i.e. Narration, Description, Argumentation and Exposition. 

When a conjunction is used to connect two independent clauses, a comma should be used before the conjunction.

To conclude, conjunctions are vital to constructing well-formed sentences in English. Whether writing or speaking, using the right conjunctions will help one convey their message more clearly and effectively.

Yes, it is acceptable to begin a sentence with conjunctions like "but," "and," or "because," but they should be used sparingly.

Coordinating conjunctions connect clauses of equal grammatical weight (e.g., two independent clauses) whereas Subordinating conjunctions (like because, although, while) connect an independent clause to a dependent clause and show the relationship between them (cause, time, contrast, etc.).
Example (Coordinating): He was tired, yet he kept running.
Example (Subordinating): Although he was tired, he kept running.

Yes, in informal speech or writing, conjunctions may sometimes be omitted for brevity.

Conjunctions are used to connect words, phrases, or clauses, allowing us to express more complex and meaningful thoughts in a simpler and smooth way.

If the statement is a universal truth or still relevant, verbs won't change typically. For example, the direct speech: "Water boils at 100 degrees," said the professor, and in the indirect speech: The professor said that water boils at 100 degrees. Being a fact, "boils" stays present. This keeps truths that are timeless or current—makes sense. 

Commands using the "to" verb structure shift to indirect speech: The direct speech is "Sit down!" shouted Dad. In the indirect speech version: Dad told me to sit down. When converting to indirect speech, the nature of the command softens, quotation marks disappear, and either "told" or "ordered" matches the strength of the command. Requests typically use the same to structure: "Please wait," translates to: He asked me to wait.