Hello,

Here's the punctuated sentence:

"Oh, what a surprise! My sister Rani came to my house."

Or, alternatively:

"Oh, what a surprise! My sister, Rani, came to my house."

The added punctuation clarifies the sentence structure and makes it easier to read:

· Comma after "Oh" to separate the interjection

· Exclamation mark to convey surprise

· Comma after "surprise" for clarity

· Capital "R" in "Rani" since it's a proper noun (name)

· "came" instead of "come" for subject-verb agreement (My sister Rani is the subject)

Hello

"Oh, what a surprise! My sister Rani came to my house."

In the sentence "Oh, what a surprise! My sister Rani came to my house, some punctuation marks have been applied with the purpose of emphasizing and clarifying: Punctuation Mark Usage In the sentence "Oh, what a surprise! My sister Rani came to my house,"

some punctuation marks have been applied with the purpose of emphasizing and clarifying: Comma (,) after "Oh";.

Exclamation mark (!) after "surprise": This intensifies the feeling by exhilaration or shock at the untimely visit. It makes the sentence sound so much more enthusiastic.

Period (.) end of the second sentence: This marks the end of the statement too, meaning the thought has been completed.

In all, the punctuation added would make the sentence very readable and will pass across the intended emotions with great ease.