Make necessary corrections in the following sentences:

The original sentence contains a common grammatical error related to verb usage and prepositional phrases. Here's a breakdown of the corrections:

    
• "prayed for me that I may pass" to "prayed for me to pass": When expressing a wish or desire for someone to do something, especially after verbs like 'pray', 'wish', 'hope', the structure 'verb + for + object + to-infinitive' is often more natural and concise than using a 'that' clause with 'may' or 'might'. "Prayed for me to pass" directly states the desired action.
    
• "pass in the examination" to "pass the examination": The verb "pass" when referring to successfully completing an examination is transitive and takes the examination as its direct object. Therefore, no preposition like "in" or "at" is needed before "the examination." We say "pass an exam," not "pass in an exam."

The corrected sentence, "Father prayed for me to pass the examination," is grammatically sound, more concise, and idiomatic in standard English.

“One should do their duties.”

When multiple pronouns of different persons (first, second, and third person) are used in a sentence, there is a conventional order to maintain politeness and grammatical correctness, especially in positive or neutral contexts.

    
• The 2-3-1 Rule: For positive or neutral statements, the standard order is:         
              
  1. Second person pronoun (you)
              
  2. Third person pronoun (he, she, it, they, or a noun)
              
  3. First person pronoun (I, we)
          
      
    
• Example: In the original sentence "I, you and he were present in the meeting," the pronouns are first person (I), second person (you), and third person (he). Following the 2-3-1 rule, the correct order is "You, he, and I."
    
• The 1-2-3 Rule (for negative or confessing faults): If the sentence expresses a negative idea, admits a mistake, or assigns blame, the order is usually reversed to 1-2-3 (First person, Second person, Third person) to take responsibility first. For example, "I, you, and he are responsible for the error."

The phrase "senior brother" is grammatically incorrect. While "senior" means older or higher in rank, it is typically used in formal contexts and is followed by the preposition 'to' when indicating a comparison in age or rank (e.g., "He is senior to me").

For referring to an older sibling, the correct terms are "elder" or "older."

• Elder: This adjective is specifically used for comparing the ages of siblings or family members, implying a more personal relationship. It is not followed by "than." For example, "My elder sister lives abroad."
• Older: This is a more general term for comparing age and can be used for people or things, including siblings. It can be followed by "than." For example, "He is older than his cousin."
• Senior/Junior: These Latin-derived adjectives denote higher/lower rank, position, or relative age, especially in formal or professional settings. They are always followed by the preposition 'to', never 'than'. Examples: "She is senior to me in the department." "He is junior to his boss." Other similar words that take 'to' include 'superior', 'inferior', 'prior', 'posterior', and 'preferable'.