Explanation

Generally sympathy is followed by for.

Sympathy means ہمدردی

I have no sympathy for him means مجھے اس کے لئے کوئی ہمدردی نہیں

Explanation

I'm sorry for getting angry with you yesterday.

کل آپ سے ناراض ہونے کے لیے معذرت خواہ ہوں۔

This means apologizing for the action of being angry towards someone.

Explanation

Pity is generally followed by on.

On is a preposition here.

Have pity on her means اس پر رحم کریں۔

Explanation

We generally use about with concerned.

About is a preposition here.

Concerned about something means کسی کے بارے میں فکرمند ہونا

He is very concerned about the economy. 

Explanation

Laugh at someone means کسی بندے پر ہنسنا

Laugh over means کسی بات پر ہنسنا

We all laughed over the affair. 

Explanation

Hinder from doing something means کسی کام سے روکنا

From is a preposition here. 

Explanation

We use preposition On before Foot.

On Foot means پیدل  

You can go on foot means آپ پیدل جاسکتے ہیں

Explanation

Words like, morning, evening, midnight, June 2014, etc. are generally followed by the preposition Since. 

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Explanation

• hydrogen gas can not use as fuel
• ***
• "AS " is best to keep the meaning of the original sentence
• ****
• TWO REASONS WHY WE USE THE "AS" PREPOSITION IN THE ABOVE SENTENCE

• 1: We use as with a noun to refer to the role or purpose of a person or thing:
• Fuel is a noun 
• ****
• 2: "AS" preposition is used in those sentences in which two things indicate the same meaning or use the same purpose
• For example 
• Hydrogen can also serve as fuel. 
• 
  

Explanation

A preposition is a word or group of words used before a noun, pronoun, or noun phrase to show direction, time, place, location, spatial relationships, or to introduce an object. Some examples of prepositions are words like "in," "at," "on," "of," and "to." Prepositions in English are highly idiomatic.