Explanation

He gave a talk on the causes of dengue fever.

***

we use the "on" preposition because we talk  "on" causes of dengue fever

**

ND10-1-2023

Explanation

Words like Above, In, On, Behind, Between outside etc are considered to Preposition of Place. 

AGM 08-01-2023

Explanation

Over is a preposition.

Over also means in many parts of the world.

All over the world means دنیا بھر میں

Explanation

We use Preposition During to say when something happens.

During this year, During this weekend, During this decade, during the post-war years etc.

Explanation

We use Preposition During to say when something happens.

During this year, During this weekend, During this decade etc.

Explanation

 She died at 7 PM on 12th August.

We use preposition at before time. Like at 12 AM, at 7 PM, at 11 AM etc.

We use preposition on before a date. Like on 12th August, On 5th June, On 8th December etc.

Explanation

Break Through is a phrasal verb which means توڑ کر نکال دینا

Can anyone break through this iron ball?

AGM 08-01-2023

Explanation

Adhere is followed by To.

Adhere to means قائم رہنا

For example: You must adhere to your promise. 

Explanation

She hurried to the supermarket so that she might get some things before it closed.

So that means تاکہ

Before means پہلے 

Explanation

We use preposition From to refer to origin (where something comes from)

This present is for my grandmother: یہ تحفہ میری دادی کیلئے ہے

This present is from my grandmother: یہ تحفہ میری دادی کی طرف سے ہے