Explanation

He came home at midnight.

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We use "at" to specify a particular point in time

Both noon and midnight are very short periods.

We would therefore say: at midnight or at noon.

Explanation

Before & Within

Before = point of time

Within = period of time

Please go there before Friday means برائے مہربانی جمعے سے قبل وہاں جائیں

Explanation

Hear from means کسی سے باتیں کرنا

Heard of means سننا

From is a preposition here.

I have not heard from him for a long time. 

Explanation

Usage of IN and INTO

In = inside to inside.

My mother is in the house.

Into = motion inward

He jumped into the swimming pool.

Explanation

Generally pride is followed by on.

On is a preposition here.

Proud on something means کسی بات پر غرور کرنا

Explanation

We generally use on after purpose.

On purpose is a phrase.

On purpose means intentionally.

On purpose means جان بوجھ کر

He did not do this on purpose. 

Explanation

We generally use on after purpose.

On purpose is a phrase.

On purpose means intentionally.

On purpose means جان بوجھ کر

He has shattered my window on purpose.

Explanation

Tom’s party has been called off (cancelled)

C. called off

call off

phrasal verb of call

cancel an event or agreement.

"they held a ballot on whether to call off industrial action"

Explanation

Generally sensible is followed by of.

Of is a preposition here.

Sensible of something means کسی بات کا احساس ہونا

We are sensible of the difficulties he faces.

Explanation

Be worried about something means کسی چیز کے بارے میں فکر مند ہونا

About is a preposition here.