You gave a 5-taka note to an old woman. She said, "May Allah bless you."
Again,
You are going to sit for the final examination. Mother said, "May Allah grant you grand success."
The sentences within "--" are optative (= wish) sentences. Speeches expressing wishes usually start with May and sometimes, also without May. For example: God bless you.
Now, Such speeches are also called wishes, as ---
I wish I could be there to help you. I wish I were so rich as to help you.To be brief, any speech expressing wish is an optative sentence.
Exclamations:
Exclamation is what we utter to exppress sudden feelings. It may be joy, admiration, sorrow, happiness, surprise or astonishment, wonder, anger, disgust/hate etc. Look below:
Hurrah! we have won the game. (joy) Bravo! you have won. (admiration) Alas! I am undone. (sorrow) Ah! at last we have reached our goal. (happiness) What* a beautiful bird it is! (wonder)
How* sweet a girl you are! (admiration) You did it! (surprise/astonishment) What a fool you are! (disgust) Fie! you are a thief. (hate) What! how dare you! (anger)
Observe carefully that exclamations are made by either putting what, how, or such exclamatory words as Alas, Fie, Ah, Oh etc. are words of exclamation, expressing different feelings such as has been shown in the brackets.
* Observe carefully the use of What and How as introductory words of exclamation. Both what and how take an adjective after them; but the construction is What a + Adj, but How + Adj + a.
That's all for now. Feel free to ask any question. Good night and sweet dreams.