Agriculture
Vitamin D-licious Mushrooms
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Protecting Cows—and People—from a Deadly Disease
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Newts
Poison Dart Frogs
Frogs and Toads
Animals
A Whale's Amazing Tooth
Firefly Delight
Deep Krill
Behavior
Pondering the puzzling platypus
Mice sense each other's fear
Face values
Birds
Blue Jays
Ducks
Hummingbirds
Chemistry and Materials
Earth-Friendly Fabrics
Butterfly Wings and Waterproof Coats
Toxic Dirt + Avian Flu = Science Fair Success
Computers
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Earth
Giving Sharks Safe Homes
Distant Quake Changes Geyser Eruptions
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Environment
Power of the Wind
Antarctica warms, which threatens penguins
Snow Traps
Finding the Past
Stone Tablet May Solve Maya Mystery
Early Maya Writing
Little People Cause Big Surprise
Fish
Freshwater Fish
Electric Ray
Swordfish
Food and Nutrition
A Taste for Cheese
Eat Out, Eat Smart
Chocolate Rules
GSAT English Rules
Finding Subjects and Verbs
Who vs. That vs. Which
Adjectives and Adverbs
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Human Body
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Gut Germs to the Rescue
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Invertebrates
Insects
Invertebrates
Crawfish
Mammals
Dachshunds
Yorkshire Terriers
Blue Bear
Parents
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What Not to Say to Emerging Readers
How children learn
Physics
Powering Ball Lightning
Black Hole Journey
One ring around them all
Plants
A Giant Flower's New Family
Cactus Goo for Clean Water
A Change in Leaf Color
Reptiles
Reptiles
Boa Constrictors
Sea Turtles
Space and Astronomy
Ready, Set, Supernova
Killers from Outer Space
A Family in Space
Technology and Engineering
Supersuits for Superheroes
Bionic Bacteria
Algae Motors
The Parts of Speech
Pronouns
Problems with Prepositions
Adjectives and Adverbs
Transportation
Ready, unplug, drive
Robots on the Road, Again
Reach for the Sky
Weather
Catching Some Rays
Weekend Weather Really Is Different
Science loses out when ice caps melt
Add your Article

Who vs. That vs. Which

Rule 1

Who refers to people. That and which refer to groups or things.

Examples:
Anya is the one who rescued the bird.
Lokua is on the team that won first place. 
She belongs to an organization that specializes in saving endangered species.

Rule 2

That introduces essential clauses while which introduces nonessential clauses.

Examples:
I do not trust products that claim "all natural ingredients" because this phrase can mean almost anything.
We would not know which products were being discussed without the that clause.
The product claiming "all natural ingredients," which appeared in the Sunday newspaper, is on sale.
The product is already identified. Therefore, which begins a nonessential clause.

NOTE: Essential clauses do not have commas surrounding them while nonessential clauses are surrounded by commas.

Rule 3

If this, that, these, or those has already introduced an essential clause, you may use which to introduce the next clause, whether it is essential or nonessential.

Examples:
That is a decision which you must live with for the rest of your life.
Those ideas, which we've discussed thoroughly enough, do not need to be addressed again.

NOTE: Often, you can streamline your sentence by leaving out which.

Example:
That is a decision which you must live with for the rest of your life.

Better:
That is a decision you must live with for the rest of your life.

 

Who vs. That vs. Which









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