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12-Minute Mastery • C1 Grammar

💧 Water Scarcity & Advanced Relative Clauses

Learn four ways to join ideas about water: whereby, which (for a whole idea), the extent to which, and preposition + which. Four ways to combine ideas in formal writing.

📋 How to Use This Lesson

🧑‍🏫 Teacher Quick-Guide (12 Mins)

• Allocate 3 minutes for students to study the 4 core patterns and real-world models.
• Have learners work through the 12 graded practice items independently.
• Pair students to compare bracketed hints and justify their choices.
• Highlight the "Why This Works" callout to clear up common C1 pitfalls.

🎒 Student Steps

• Read each rule and notice how the water management example is formed.
• Tackle the 12 exercises step-by-step from multiple-choice to message editing.
• Look out for single-word hints in brackets [...] whenever you get stuck.
• Watch out for tricky traps like using "that" after a comma or skipping "to".

An arid, cracked riverbed illustrating water scarcity.

A modern irrigation system in a field.

🧠 Core Reference: 4 Advanced Relative Patterns

Four elegant ways to combine ideas in academic and professional English without sounding clunky.

1. whereby

= by which / through which

Describes an official system, legal rule, or planned process where something happens.

"The government introduced a scheme whereby each farm is allocated a fixed amount of water."

2. , which

= refers to the entire clause

Comments on the whole previous fact or outcome (never use "that" after this comma).

"Rainfall has fallen steadily, which has left the reservoir almost empty."

3. the extent to which

= how much / the degree

Measures the level, intensity, or reach of an issue. Always keep the preposition "to".

"The extent to which farmers waste water through irrigation is often underestimated."

4. prep + which/whom

= formal fronting

Moves the preposition before the pronoun in formal writing (e.g. depend on → on which).

"The river on which millions of people depend is now contaminated."

⚡

Why This Works In Real Life

Instead of stacking short, choppy sentences ("Water is scarce. This causes panic."), advanced writers use these four structures to show cause, degree, and mechanism in one breath. Keep in mind:

Avoid "that" after commas: Write ", which limits consumption", never ", that limits".

Don't drop "to": Always write "the extent to which". Leaving out "to" is one of the most common exam errors.

1 Section 1: Choose the Correct Sentence

Select the option that correctly uses the target grammar structure.

1. The regional council created an emergency water agreement ______ households pay higher rates during severe drought.

[system]

Choose the formal relative word that introduces this policy mechanism:

____ a. where ____ b. whereby ____ c. that ____ d. in that

2. Years of unchecked extraction caused acute groundwater depletion, ______ threatens the survival of local citrus orchards.

[whole idea]

Which word correctly refers back to the entire situation after the comma?

____ a. that ____ b. what ____ c. which ____ d. whose

3. This arid district has only one natural reservoir, ______ the surrounding communities rely for their winter irrigation.

[formal]

Choose the correct preposition placement for formal academic English:

____ a. on which ____ b. which on ____ c. that ____ d. where on

2 Section 2: Join the Two Ideas

Combine both sentences into one concise C1 sentence using the single-word clue in brackets.

Sentence A: Over-extraction of groundwater continues unchecked.

Sentence B: This leads to irreversible aquifer depletion.

Complete the combined sentence using the clue in brackets:

Over-extraction of groundwater continues unchecked, ____ (type 2 words) to irreversible aquifer depletion. [result]

Sentence A: Hydrologists built three test wells across the arid basin.

Sentence B: Scientists rely on these wells to monitor groundwater levels.

Combine into one formal statement:

Hydrologists built three test wells across the arid basin, ____ (prep + pronoun) scientists rely to monitor groundwater levels. [rely]

Sentence A: Authorities created a cooperative framework.

Sentence B: Under this system, water managers allocate equal shares to dry regions.

Join the statements to describe the system in one word:

Authorities created a cooperative framework ____ (1 word) water managers allocate equal shares to dry regions. [system]

3 Section 3: Fill the Missing Gaps

Complete each sentence using the appropriate relative phrase indicated by the bracketed clue.

7. Measuring water consumption during drought:

[degree]

Researchers were shocked by ____ (4-word phrase) domestic consumption spiked despite widespread scarcity warnings.

8. Automated irrigation systems (one word):

[mechanism]

The farm installed a drip irrigation system ____ (1 word) water is released only when soil sensors detect severe dehydration.

9. Contaminated water supply:

[reservoir]

Chemical runoff began to contaminate the central reservoir, ____ (2 words) thousands of families draw their everyday drinking water.

4 Section 4: Fix the Mistake

Two students, Leo and Maya, are texting about their water conservation project. Spot and correct the underlined grammar error in each chat message.

Leo • 10:14 AM

"Did you finish reading the report? I was stunned by the extent which older irrigation canals leak before reaching crops."

Type the complete 4-word correct phrase:

____ (type the 4-word correction) [missing]

Maya • 10:17 AM

"Yes! Prolonged heat has caused extreme water scarcity, that makes replenishing the reservoir almost impossible this summer."

Replace the 2 underlined words with the correct relative pronoun and verb:

____ (type 2 words) [comma]

Leo • 10:20 AM

"Our draft says: 'The city depends on three primary aquifers, which thousands of farms rely for their irrigation.' Our draft sounds too informal, and something is missing."

Fix the underlined word by inserting the required preposition before it (2 words):

____ (prep + pronoun) [rely]

Advanced Relative Clauses: Water Scarcity

💧 Water Scarcity & Advanced Relative Clauses

📋 How to Use This Lesson

🧠 Core Reference: 4 Advanced Relative Patterns

Why This Works In Real Life

1 Section 1: Choose the Correct Sentence

2 Section 2: Join the Two Ideas

3 Section 3: Fill the Missing Gaps

4 Section 4: Fix the Mistake

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