Explanation

Smog is formed when pollutant gases like nitrogen oxides and hydrocarbons react in sunlight (photochemical reaction).

It creates a thick, hazy air harmful to health, especially in urban areas.

Explanation

The correct preposition is "from" because it indicates being away or not present in a specific place, in this case, the class.

The phrase should read: "They were absent from the class."

Explanation

The entire house was painted by Tahir.

The original sentence is in simple past tense ("painted"), so the passive voice must also be in simple past.

"Was painted" correctly changes the active sentence to passive in past tense.

Explanation

"Success" is an abstract noun because it refers to a concept or an idea, something that cannot be physically touched or seen.

Abstract nouns represent feelings, qualities, or states.

Voncrete nouns which refer to physical objects.

Explanation

Impoverished means غریب

Without money means پیسے کے بغیر

Explanation

"However" shows contrast between having no clues and tips still coming in.

It logically connects two opposing ideas in a single sentence.

Explanation

سُقم کے معنی ہیں خرابی، نقص یا بیماری۔

یہ لفظ اکثر صحت یا حالات میں خرابی کے لیے استعمال ہوتا ہے۔

Explanation

"All the kids" is a noun phrase because it functions as the subject of the sentence and contains a noun ("kids") with modifiers.

A noun phrase centers around a noun and may include determiners or adjectives.

Explanation

"May" is used to express possibility, indicating that there is a chance of rain.

The sentence suggests uncertainty, and "may" conveys that possibility.

Explanation

The prefix "kilo-" in the metric system means 1000 times the base unit.

For example, 1 kilometer = 1000 meters, and 1 kilogram = 1000 grams.