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
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• "AS " is best to keep the meaning of the original sentence
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• 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 
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• 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. 
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Explanation

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.

Explanation

We can get triumph over all obstacles

ہم تمام رکاوٹوں پر فتح حاصل کر سکتے ہیں۔

The word "over" is used as a preposition to indicate the spatial or metaphorical position of triumph relative to obstacles. 

Explanation

She has two children from her first husband.

اس کے پہلے شوہر سے دو بچے ہیں۔

We use" from" to refer to where someone or something starts or originates ( child from first husband)

Explanation

Lay کسی اور کو لٹانا 

Second form: Laid

Third form: Laid

Lie خود لیٹنا

Second form: Lay

Third form: Lain 

Ahmed lay in the shade of a tree before going for a walk 

احمد چہل قدمی سے پہلے درخت کے سائے میں لیٹ گیا

Explanation

Part from someone کسی انسان سے الگ ہونا

Part with someone کسی چیز سے الگ ہونا

The mother parted from her daughter in sorrow ماں غم میں بیٹی سے جدا ہو گئی۔

Explanation

He signed on the paper is the correct sentence which means اس نے صفحے پر دستخط کیا

Do not use on after sign.

Sign is a main verb not noun here.

Explanation

Since is a preposition

Since = point of time (present & past)

He has been studding since morning means وہ صبح سے مطالعہ کررہا ہے

Explanation

Usage of BETWEEN and AMONG

Between دو کے درمیان

Among دو سے زائد کے درمیان

Najma stands between Shazia and Amina.

Divide these biscuits among these four children.