However, I can provide you with detailed information about the topics you mentioned, which are "to be" verb, punctuation, and WH-questions in English grammar for Class 4 students. Please find the detailed explanation below:

**1. To Be Verb:**
- The "to be" verb includes forms such as am, is, are, was, and were.
- This verb is used to indicate a state of being, existence, possession, or identity.
- It is often used to connect the subject of a sentence with a noun, pronoun, or adjective that describes or identifies it.
- For example:
- She is a teacher. (connects the subject "she" with the noun "teacher")
- They were happy. (connects the subject "they" with the adjective "happy")

**2. Punctuation:**
- Punctuation marks are used to enhance clarity and meaning in written language.
- Some common punctuation marks include the comma (,), period (.), question mark (?), exclamation mark (!), and apostrophe (').
- Commas are used to separate items in a list, indicate pauses in a sentence, or separate clauses.
- Periods are used to indicate the end of a sentence.
- Question marks are used to indicate a direct question.
- Exclamation marks are used to show strong emotions or exclamatory statements.
- Apostrophes are used to indicate possession or contraction.
- Proper punctuation helps convey meaning, avoid confusion, and make writing more effective.

**3. WH-Questions:**
- WH-questions are questions that start with words such as who, what, where, when, why, and how.
- These questions seek information about a specific subject.
- The WH-word is placed at the beginning of the sentence, followed by the auxiliary verb (e.g., do, does, did, can, will) and the subject.
- For example:
- Who is your best friend?
- What did you eat for lunch?
- Where are you going?
- When is your birthday?
- Why are you crying?
- How did you solve the problem?

In conclusion, understanding the "to be" verb, punctuation, and WH-questions are important aspects of English grammar for Class 4 students. These concepts help in forming correct sentences, expressing ideas clearly, and asking questions to gather information. Remember to practice these concepts through various exercises and examples to strengthen your understanding.