Agriculture
Watching out for vultures
Keeping Bugs Away from Food
Growing Healthier Tomato Plants
Amphibians
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Tree Frogs
Salamanders and Newts
Animals
Polly Shouldn't Get a Cracker
Clone Wars
Copybees
Behavior
Diving, Rolling, and Floating, Alligator Style
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Baby Number Whizzes
Birds
Hummingbirds
Parakeets
Flightless Birds
Chemistry and Materials
Bang, Sparkle, Burst, and Boom
The Incredible Shrunken Kids
The hottest soup in New York
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Programming with Alice
Troubles with Hubble
New eyes to scan the skies
Dinosaurs and Fossils
Fossil Fly from Antarctica
Hall of Dinos
Supersight for a Dino King
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Earth
Shrinking Glaciers
Arctic Algae Show Climate Change
A Volcano's Deadly Ash
Environment
Forests as a Tsunami Shield
Where rivers run uphill
Fungus Hunt
Finding the Past
Preserving Ancient Warrior Paint
Decoding a Beverage Jar
Stone Age Sole Survivors
Fish
Halibut
Flashlight Fishes
Sturgeons
Food and Nutrition
Chocolate Rules
How Super Are Superfruits?
Making good, brown fat
GSAT English Rules
Order of Adjectives
Whoever vs. Whomever
Pronouns
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How a Venus Flytrap Snaps Shut
Monkeys Count
It's a Math World for Animals
Human Body
Germ Zapper
Running with Sneaker Science
Football Scrapes and Nasty Infections
Invertebrates
Flies
Sea Urchin
Corals
Mammals
Black Bear
Little Brown Bats
Rottweilers
Parents
Choosing a Preschool: What to Consider
The Surprising Meaning and Benefits of Nursery Rhymes
What Not to Say to Emerging Readers
Physics
Extra Strings for New Sounds
Hold on to your stars, ladies and gentlemen
Project Music
Plants
Sweet, Sticky Science
Springing forward
Fastest Plant on Earth
Reptiles
Reptiles
Asp
Alligators
Space and Astronomy
Melting Snow on Mars
Ringing Saturn
Witnessing a Rare Venus Eclipse
Technology and Engineering
Space Umbrellas to Shield Earth
Roll-Up Computer Monitors to Go
Spinach Power for Solar Cells
The Parts of Speech
Countable and Uncountable Nouns
What is a Preposition?
What is a Noun
Transportation
Revving Up Green Machines
Reach for the Sky
Tinkering With the Basic Bike
Weather
The Best Defense Is a Good Snow Fence
Arctic Melt
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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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