Explanation

"She's been known to sing beautifully", commented Ali.

Quotation marks are used to enclose the exact words spoken, which are: She's been known to sing beautifully.

The speaker (Ali) comes after the quote, so the quotation marks begin and end around the spoken words.

Explanation

If I knew her name, I would tell you means

اگر مجھے اس کا نام معلوم ہوتا تو میں آپ کو بتاتا

The second part of the sentence is in the past tense.

The verb to be used should also be in the same tense.

The past tense of the word "know" is "knew".

Therefore, the correct tense here is past tense and the verb used is "knew".

Explanation

Punctuation is a series of symbols and marks that make written language easier to read.

We use punctuation marks to denote pauses, separate elements of sentences, or add emphasis to parts of our writing.

Explanation

Either or takes verb from second subject (he) 

We use is with he or she. 

Either you or he is at fault یا تو آپ یا وہ غلطی پر ہیں

Explanation

Is this the bus, which goes to the Sadar Bazar?

"Which" is the correct relative pronoun to use in this context.