Explanation

His knowledge of the subject is extensive.

اس موضوع پر ان کا علم وسیع ہے۔

"Extensive" means having a large or broad scope.

So, the sentence suggests that his knowledge of the subject is wide-ranging and thorough.

Explanation

Live with means کسی کے ساتھ رہنا

Live on means گزارا کرنا

Live by means اصولوں کے ساتھ رہنا

The tribe lived by different customs قبیلہ مختلف رسم و رواج کے مطابق رہتا تھا

Explanation

The sentence "She will have left before you go to see her." 

It requires a future perfect tense (will have + past participle) because it describes an action that will be completed before another future action ("you go to see her").

Explanation

The sentence should be: "I have no other object than to study."

میرے پاس پڑھائی کے علاوہ کوئی مقصد نہیں۔

"Than" is used here to indicate a purpose or intention, similar to "except" or "other than".

Explanation

"A few words spoken in earnest will convince him."

جوش سے کہے گئے چند الفاظ اسے قائل کر لیں گے۔

This implies that a small number of sincere words will be enough to persuade him.

Explanation

"Each" is used to indicate that the action applies individually to all members of a group.

In this sentence, it implies that he wore multiple bracelets on both hands individually. 

Explanation

• This sentence indicates that the subject (he) has been engaged in the action of working on the project for an extended period, specifically for several months.
• The verb "has worked" is in the present perfect tense, signifying an action that started in the past and has relevance to the present moment.

Explanation

Depend upon someone کسی انسان پر بھروسہ کرنا

Depend on منحصر ہونا

Can I depend upon your help? کیا میں آپ کے سہارے کا بھروسہ کرسکتا ہوں

Explanation

John would force himself to work on till late in the night.

جان خود کو رات گئے تک کام کرنے پر مجبور کرتا۔

Here "Would" shows possibility.

"Would" is used to indicate a habitual action in the past.

"Could" implies ability, which does not fit the context of forcing oneself.

"Would be" is incorrect because "force" is a verb and does not require "be."

Explanation

"Unless" means "except if" and fits logically here:

• The speaker is saying, "Do not watch TV except if I have nothing to do."

"Unless" introduces the only condition when watching TV is allowed.