A word governing, and usually preceding, a noun or pronoun and expressing a relation to another word or element in the clause is called preposition.
Here boy is not specific.
We use the for specific nouns.
A boy is swimming in the pool. (Correct)
Boycott بائیکاٹ
epidemic
وبا
synonyms for epidemic
pandemic.
sweeping.
communicable.
prevailing.
prevalent.
rampant.
To make a question in the Past Tense in English we normally put the auxiliary DID at the beginning of the question or before the main subject.
We can also use by before a specific time.
By is a preposition here.
Here by 9 means نو بجے تک
Disheveled منتشر۔ خراب کرنا, بے ترتیب کرنا
Tidy صاف ستھرا, نفیس
بہتی گنگا میں ہاتھ دھونا ۔ وقت کو غنیمت جانو
Take advantage of the chance to do something while conditions are good.
Given sentence is in Past simple tense and it is in active voice, we need to change it into passive voice.
Rule : Subject + (was / were) + V3 + Optional Agents
ü To ensure something is to make sure it happens -- to guarantee it.
ü To insure something or someone is to cover it with an insurance policy.
ü To assure someone is to remove someone’s doubts.