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Treating peanut allergy bit by bit
Keeping Bugs Away from Food
Silk’s superpowers
Amphibians
Toads
Poison Dart Frogs
Salamanders and Newts
Animals
Killer Flatworms Hunt with Poison
Spotting the World's Leggiest Animal
Saving Africa's Wild Dogs
Behavior
Copycat Monkeys
Listen and Learn
A Recipe for Happiness
Birds
Carnivorous Birds
Albatrosses
Falcons
Chemistry and Materials
Boosting Fuel Cells
Flytrap Machine
Atom Hauler
Computers
Look into My Eyes
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Dinosaurs and Fossils
Message in a dinosaur's teeth
Downsized Dinosaurs
Digging Dinos
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Results of GSAT are in schools this week
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Earth
Life trapped under a glacier
Easy Ways to Conserve Water
Meteorites may have sparked life on Earth
Environment
Forests as a Tsunami Shield
Plastic Meals for Seals
Island Extinctions
Finding the Past
Big Woman of the Distant Past
Ancient Art on the Rocks
Early Maya Writing
Fish
White Tip Sharks
Codfish
Lampreys
Food and Nutrition
Chew for Health
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Making good, brown fat
GSAT English Rules
Capitalization Rules
Finding Subjects and Verbs
Problems with Prepositions
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Math Naturals
How to Slice a Cake Fairly
Human Body
Electricity's Spark of Life
Prime Time for Broken Bones
Walking to Exercise the Brain
Invertebrates
Tapeworms
Shrimps
Arachnids
Mammals
Coyotes
Asiatic Bears
Wolverines
Parents
What Not to Say to Emerging Readers
The Surprising Meaning and Benefits of Nursery Rhymes
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Physics
Gaining a Swift Lift
Spin, Splat, and Scramble
Echoes of a Stretched Egg
Plants
A Change in Leaf Color
Pumping Up Poison Ivy
Bright Blooms That Glow
Reptiles
Asp
Rattlesnakes
Sea Turtles
Space and Astronomy
Wrong-way planets do gymnastics
Saturn's New Moons
Slip-sliding away
Technology and Engineering
Shape Shifting
A Clean Getaway
Beyond Bar Codes
The Parts of Speech
What is a Verb?
What is a Noun
Problems with Prepositions
Transportation
Middle school science adventures
Reach for the Sky
Troubles with Hubble
Weather
Antarctica warms, which threatens penguins
The solar system's biggest junkyard
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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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