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EnglishUnit 186 min read

Clauses, Conditionals & Prepositions: Rules, Uses & Exam Tricks

Unit 18 of English teaches how clauses (main/subordinate), conditionals (real/unreal), and prepositions (place/time) work in sentences, with NEB-style exercises and common mistakes to avoid.

TAKEAWAYS:

  • Clauses are sentence parts with a subject and verb: main clauses stand alone, subordinate clauses depend on others (e.g., "She left because she was tired").
  • Conditionals show hypotheticals: real (Type 1: "If it rains, we’ll stay home"), unreal (Type 2/3: "If I were rich…").
  • Prepositions link nouns/pronouns to other words (e.g., "on the table," "at 5 PM"). Common errors: "on time" (not "in time" for deadlines).
  • Mixed conditionals combine types (e.g., "If you had listened (past), you wouldn’t be in trouble (present)").
  • NEB loves testing clause identification, conditional transformations, and prepositional errors in editing tasks.

1. Clauses: The Building Blocks of Complex Sentences

Clauses are groups of words with a subject + verb. They can be independent (main clauses) or dependent (subordinate clauses).

Types of Clauses

Type Definition Example Role in Sentence
Main Clause Can stand alone (complete thought) "She sang beautifully." Independent
Subordinate Clause Depends on a main clause (incomplete) "Because she practiced daily" Dependent (adverb, noun, adj)

How to Identify Clauses:

  • Look for subject + verb groups.
  • Subordinate clauses often start with conjunctions (if, because, although, when) or relative pronouns (who, which, that).

Example Trace: Sentence: "The book which I borrowed was interesting."

  • Main clause: "The book was interesting."
  • Subordinate clause: "which I borrowed" (relative clause modifying "book").

NEB-Style Question: Identify the subordinate clause in: "He failed the exam because he didn’t study." Answer: "because he didn’t study" (adverb clause of reason).


2. Conditionals: Hypothetical Situations

Conditionals express real, possible, or imaginary situations. There are four main types:

Type 1: Real/Possible Conditions (Present/Future)

  • Form: If + present simple, will/can + base verb
  • Use: For real or likely situations.
  • Example:
    • "If it rains (present), we will cancel the picnic (future)."

Type 2: Unreal Conditions (Present/Dream)

  • Form: If + past simple, would/could + base verb
  • Use: For unreal or dream situations (now or generally).
  • Example:
    • "If I were rich (unreal now), I would travel the world (dream)."
    • Note: Always use "were" (even for I/he/she) in Type 2!

Type 3: Unreal Past Conditions

  • Form: If + past perfect, would have + past participle
  • Use: For unreal past situations.
  • Example:
    • "If she had studied (past perfect), she would have passed (would + have + past participle)."

Mixed Conditionals (Type 2 + 3)

  • Combine present and past unreal situations.
  • Example:
    • "If you had listened to me (past), you wouldn’t be in trouble (present)."

Common Mistakes:

  • ❌ "If I was you…" → ✅ "If I were you…" (Type 2)
  • ❌ "She would pass if she studies hard." → ✅ "She would pass if she studied hard." (Type 2 needs past simple in if)

NEB-Style Question: Rewrite using Type 3 conditional: "He lost his job. He didn’t save money." Answer: "If he had saved money, he wouldn’t have lost his job."


3. Prepositions: Linking Words in Time, Place, and Relationships

Prepositions show relationships between words (e.g., time, place, direction). They are small but critical—many NEB errors come from wrong prepositions!

Common Prepositions by Category

Category Prepositions Example
Place in, on, at, under, above, near "The book is on the table."
Time in, on, at, during, before, after "She arrives at 5 PM."
Direction to, from, into, out of "He went to school."
Manner with, by, like "She speaks with confidence."

Tricky Prepositions (NEB Favorites!):

  • "On time" (correct) vs. "in time" (for deadlines: "We arrived in time for the train.")
  • "At home" (correct) vs. "in home" (❌ wrong)
  • "Afraid of" (correct) vs. "afraid for" (❌ wrong)

NEB-Style Question: Fill in the blank: "The meeting is scheduled ___ 3 PM." Answer: "at" (time of day uses at).


4. Exam Tips: How to Score Full Marks

  1. Clauses:

    • Underline clauses in complex sentences to identify main vs. subordinate.
    • For NEB editing tasks, circle prepositions and check if they fit the context.
  2. Conditionals:

    • Memorize the forms (Type 1: if + present → will; Type 2: if + past → would).
    • Watch for mixed conditionals in questions (e.g., past result + present consequence).
  3. Prepositions:

    • Learn collocations (fixed phrases like "on time," "in trouble").
    • Practice error correction: "She is afraid for spiders" → "afraid of spiders."
  4. Common NEB Patterns:

    • Rewrite sentences using conditionals (e.g., "He failed because he didn’t study" → "If he had studied, he would have passed.").
    • Complete the sentence with the correct preposition (e.g., "The keys are ___ the drawer" → "in").

5. Practice Exercises (NEB-Style)

A. Clauses (Identify & Classify)

  1. "The man who stole the car was arrested."

    • Subordinate clause: _______________
    • Type: _______________ (adjective/adverb/noun)
  2. "She left because she was tired."

    • Subordinate clause: _______________
    • Type: _______________

B. Conditionals (Rewrite)

  1. "He is sick. He didn’t eat well." → "If he had eaten well, he wouldn’t be sick."

  2. "You will pass if you work hard." → Type: _______________

C. Prepositions (Fill in the Blanks)

  1. "The cat is sleeping ___ the sun." → Answer: _______________

  2. "We arrived ___ time for the ceremony." → Answer: _______________


Answers: A1. "who stole the car" (adjective), A2. "because she was tired" (adverb) B1. Type 3, B2. Type 1 C1. "in", C2. "in"


Final Advice:

  • Clauses: Practice breaking sentences into parts.
  • Conditionals: Write 5 sentences for each type daily.
  • Prepositions: Keep a list of 10 tricky ones and revise weekly.

Good luck for your NEB exam! 🚀

Based on the NEB +2 Humanities syllabus for English (Eng), unit 18.

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