Explanation

The structure "Need you buy" is a correct form of a question using "need" for asking about necessity.

This is a formal or old-fashioned way of phrasing the question.

Explanation

The sentence expresses moral obligation, and "ought to" is suitable for that.

Correct usage: "You ought to complete your homework before you go out."

Explanation

The sentence expresses regret about the past, so past perfect tense is used.

"I wish I had worked harder" is the correct form to show a past unreal situation.

Explanation

The sentence expresses a future action dependent on a condition, so "shall lend" fits.

"Shall" is used with first person (I/we) for offers or promises.

Explanation

The phrase "after the performance was over" indicates a completed action in the past.

So, the simple past tense "contacted" is correct.

Explanation

The sentence should read: "We missed the bus. Now we'll have to walk."

This indicates that the bus has departed and you were not able to board it, so you will need to walk instead.

Explanation

The phrase "passing marks" is the standard term used to describe the minimum required to pass.

"Passable" means acceptable in quality.

Explanation

The correct structure for present simple negative is: "do not + base verb" → do not care.

The idiom "not care a fig" means not care at all, and "do not care a fig" is its proper usage.

Explanation

The reporting verb "enquired" is in the past tense, so the reported speech also shifts to past: "wanted".

Correct indirect question structure is: "what he wanted", not question word order.

Explanation

You had better take care of your health.

بہتر تھا کہ آپ اپنی صحت کا خیال رکھیں۔

The phrase "had better" is used to give strong advice or a warning.

It is followed by the base form of the verb.