Grammar and Vocabulary

The foundational rule: A singular subject requires a singular verb; a plural subject requires a plural verb.

1. Compound Subjects with "And": Two singular subjects joined by *and* take a plural verb (*"Rohan and Priya are coming"*).

   Exception: When two nouns express a single unified concept or dish, they take a singular verb: *"Bread and butter is my favorite breakfast"*.

2. Parenthetical Phrases (As well as, Along with, Together with): The verb agrees strictly with the FIRST (main) subject, ignoring intervening phrases: $$\text{"The captain, along with his crew members, } \mathbf{was} \text{ rescued."}$$
3. Either...Or / Neither...Nor (Proximity Rule): The verb agrees with the subject CLOSEST to the verb: $$\text{"Neither the teacher nor the students } \mathbf{were} \text{ present."}$$ $$\text{"Neither the students nor the teacher } \mathbf{was} \text{ present."}$$
4. Distributive Pronouns (Each, Every, Either, Neither, Everyone): Always take a singular verb: $$\text{"Each of the boys } \mathbf{has} \text{ won a prize." (NOT have!)}$$
5. Quantities, Distances, and Money: Collective sums of money, periods of time, or distances regarded as a single unit take a singular verb: $$\text{"Ten kilometers } \mathbf{is} \text{ a long distance to walk."}$$ $$\text{"Fifty thousand rupees } \mathbf{was} \text{ spent."}$$

A. General Conversion Algorithm:

B. Voice Changes Across Tenses:

• Simple Present: She writes a letter $\to$ A letter is written by her.
• Present Continuous: She is writing a letter $\to$ A letter is being written by her.
• Present Perfect: She has written a letter $\to$ A letter has been written by her.
• Simple Past: She wrote a letter $\to$ A letter was written by her.
• Past Continuous: She was writing a letter $\to$ A letter was being written by her.
• Past Perfect: She had written a letter $\to$ A letter had been written by her.
• Simple Future: She will write a letter $\to$ A letter will be written by her.
• Modals: You must obey the rules $\to$ The rules must be obeyed.
• Imperatives (Commands/Requests):
  • Close the door $\to$ Let the door be closed.
  • Help the poor $\to$ The poor should be helped.

When the reporting verb is in the Past Tense (*said, told*), the tenses in the quoted speech shift backward:

A. Tense Shift Table:

• Simple Present ($V_1$) $\to$ Simple Past ($V_2$): *"I live in Delhi" $\to$ He said that he lived in Delhi.*
• Present Continuous $\to$ Past Continuous: *"I am working" $\to$ She said that she was working.*
• Present Perfect $\to$ Past Perfect: *"I have eaten" $\to$ He said that he had eaten.*
• Simple Past ($V_2$) $\to$ Past Perfect ($had + V_3$): *"I saw him" $\to$ She said that she had seen him.*
• Will / Shall $\to$ Would / Should; Can $\to$ Could; May $\to$ Might.

B. Adverbs of Time and Place Shifts:

Now $\to$ *then*; Today $\to$ *that day*; Yesterday $\to$ *the previous day / day before*; Tomorrow $\to$ *the next day / following day*; Here $\to$ *there*; This $\to$ *that*.

C. Interrogative Sentences:

• Wh-Questions: Retain the question word: *He said to me, "Where are you going?"* $\to$ He asked me where I was going (word order becomes assertive!).
• Yes/No Questions: Introduce if or whether: *He asked, "Are you unwell?"* $\to$ He asked whether I was unwell.

A. Removing "Too...To" using "So...That Not":

• *Sentence:* He is too weak to walk. $$\mathbf{\to \text{He is } \mathbf{so} \text{ weak } \mathbf{that} \text{ he } \mathbf{cannot} \text{ walk.}}$$
• *Past Tense:* He was too tired to study. $$\mathbf{\to \text{He was } \mathbf{so} \text{ tired } \mathbf{that} \text{ he } \mathbf{could not} \text{ study.}}$$

B. Interchange of Degrees of Comparison:

• Superlative: Iron is the most useful of all metals.
• Comparative: Iron is more useful than any other metal.
• Positive: No other metal is as useful as iron.