Classify each of the following sentences as Assertive, Interrogative, Imperative, Exclamatory, or Optative. Use the following abbreviations: A for Assertive, Q for Interrogative, I for Imperative, E for Exclamatory, and O for Optative.

1. If I were The Prime Minister! - O
2. They will not buy such new things. - A
3. You must not sleep till seven in the morning. - I
4. Always go out with an umbrella during the monsoons. - I
5. Please give me two tickets for the show. - I
6. How badly was he injured! - E
7. A helicopter cannot fly faster than an aeroplane. - A
8. How wonderful the rain is after the dust and heat! - E
9. Did you celebrate your birthday this year? - Q
10. Your good wishes are always with me. - A
11. Do you take exercise daily? - Q
12. Draw a line to join these points. - I
13. May he live long! - O
14. My father is not well. - A
15. What a beautiful flower it is! - E
16. May God bless you! - O
17. I shall not go out in the rain. - A
18. Shut the door carefully. - I
19. Nature is the best physician. - A
20. How old are you? - Q

In English grammar, sentences can be categorized into different types based on their function. Here are the types of sentences you need to identify for the given examples:

Optative (O): "If I were The Prime Minister!": This sentence expresses a wish or desire.
Assertive (A): "They will not buy such new things.": This sentence states a fact or belief.
Imperative (I): "You must not sleep till seven in the morning.": This sentence gives a command or advice.
Imperative (I): "Always go out with an umbrella during the monsoons.": This sentence also gives advice or instruction.
Imperative (I): "Please give me two tickets for the show.": This is a polite command or request.
Exclamatory (E): "How badly was he injured!": This sentence expresses strong emotion.
Assertive (A): "A helicopter cannot fly faster than an aeroplane.": This sentence is a simple statement of fact.
Exclamatory (E): "How wonderful the rain is after the dust and heat!": This sentence expresses strong feeling or admiration.
Interrogative (Q): "Did you celebrate your birthday this year?": This sentence asks a question.
Assertive (A): "Your good wishes are always with me.": This sentence simply states a belief or situation.
Interrogative (Q): "Do you take exercise daily?": This sentence is asking a question.
Imperative (I): "Draw a line to join these points.": This sentence gives a direct command.
Optative (O): "May he live long!": This sentence expresses a wish.
Assertive (A): "My father is not well.": This is a statement about a situation.
Exclamatory (E): "What a beautiful flower it is!": This sentence expresses admiration.
Optative (O): "May God bless you!": This is another sentence expressing a wish or prayer.
Assertive (A): "I shall not go out in the rain.": This sentence states an intention.
Imperative (I): "Shut the door carefully.": This sentence gives an instruction or command.
Assertive (A): "Nature is the best physician.": This is a general statement or belief.
Interrogative (Q): "How old are you?": This is a question asking for information.

Understanding the type of sentence not only helps with identifying the tone and intention of the speaker but also aids in the grammatical structuring of sentences in writing.