Agriculture
Chicken Eggs as Drug Factories
Earth-Friendly Fabrics
Watering the Air
Amphibians
Salamanders and Newts
Poison Dart Frogs
Salamanders
Animals
New Mammals
Professor Ant
Clone Wars
Behavior
Making Sense of Scents
Face values
Babies Prove Sound Learners
Birds
Flightless Birds
Lovebirds
Peafowl
Chemistry and Materials
A Light Delay
The science of disappearing
Silk’s superpowers
Computers
Play for Science
A Classroom of the Mind
New twists for phantom limbs
Dinosaurs and Fossils
Middle school science adventures
Tiny Pterodactyl
Battling Mastodons
E Learning Jamaica
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Earth
A Dire Shortage of Water
Life trapped under a glacier
Slower Growth, Greater Warmth
Environment
Hazy with a Chance of Sunshine
Toxic Cleanups Get a Microbe Boost
Groundwater and the Water Cycle
Finding the Past
A Long Haul
Fakes in the museum
Watching deep-space fireworks
Fish
Eels
A Grim Future for Some Killer Whales
Sharks
Food and Nutrition
The Essence of Celery
Allergies: From Bee Stings to Peanuts
How Super Are Superfruits?
GSAT English Rules
Finding Subjects and Verbs
Order of Adjectives
Capitalization Rules
GSAT Exam Preparation Jamaica
The Annual GSAT Scholarships
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Human Body
Sleeping Soundly for a Longer Life
Flu Patrol
A Better Flu Shot
Invertebrates
Daddy Long Legs
Jellyfish
Scallops
Mammals
Black Bear
Dalmatians
Manatees
Parents
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Children and Media
Physics
Extra Strings for New Sounds
Invisibility Ring
Spin, Splat, and Scramble
Plants
Underwater Jungles
A Giant Flower's New Family
Flower family knows its roots
Reptiles
Gila Monsters
Snakes
Komodo Dragons
Space and Astronomy
Mercury's magnetic twisters
Icy Red Planet
A Smashing Display
Technology and Engineering
Machine Copy
Searching for Alien Life
Weaving with Light
The Parts of Speech
Adjectives and Adverbs
Pronouns
What is a Preposition?
Transportation
Tinkering With the Basic Bike
Charged cars that would charge
Troubles with Hubble
Weather
Science loses out when ice caps melt
Antarctica warms, which threatens penguins
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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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