Explanation

Could is a modal verb.

Could can be used for polite/formal request.

Could I have some more tea please?

کیا میں مزید چائے پی سکتا ہوں؟

Explanation

Here was cheating shows past tense.

We use second form of verb (knew) in simple sentence of Past Indefinite Tense.

The examiner knew that the candidate was cheating.

Explanation

I have never seen him after that unfortunate incident.

اس ناخوشگوار واقعے کے بعد میں نے اسے کبھی نہیں دیکھا

The phrase "I have never seen him" implies the last meeting was before a specific point in time.

"After" fits best to indicate that the incident marks the point since which there has been no meeting.

Explanation

"Since" is used to indicate the time from a past event up to now or another point in the past.

The sentence refers to events that occurred after the speaker left school — so "since I left the school" is correct.

Explanation

This is the second type of Conditional Sentences.

Formula: If + past simple, would/wouldn't + verb

If they had more money, they will buy a new house اگر ان کے پاس زیادہ پیسے ہوتے تو وہ نیا مکان خرید لیتے ہیں

Explanation

If there is ing form in first word (giving) we need to use also ing form (receiving) in the last word. 

Giving is better than receiving means دینا وصول کرنے سے بہتر ہے

***

Explanation

Here we need to use verb for a.

A shows something singular.

We use is for singular.

A record of complaints is kept in the purser's office.

*****

Explanation

In 711 Muslim forces invaded and in seven years conquered the Iberian peninsula.

It became one of the great Muslim civilizations; reaching its summit with the Umayyad caliphate of Cordovain the tenth century. Muslim rule declined after that and ended in 1492 when Granada was conquered.

Explanation

Al-Mamun (786-833 CE) was the seventh Abbasid Caliph, who ruled from 813 to 833 CE.

He was a patron of learning and philosophy, and his court was renowned for its intellectual and cultural achievements.

Al-Mamun commissioned the translation of many Greek philosophical works into Arabic, including the works of Aristotle, Plato, and other prominent philosophers.

Explanation

In Hanafi jurisprudence, a marriage contract concluded without the presence of witnesses is considered valid.

The Hanafi school of thought holds that the presence of witnesses is not a essential condition for the validity of a marriage contract.