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A Microbe Nanny for Young Wasps
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A Change in Time
To Catch a Dragonfly
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Stone Tablet May Solve Maya Mystery
Fish
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Electric Ray
Food and Nutrition
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Healing Honey
GSAT English Rules
Whoever vs. Whomever
Who vs. Whom
Who vs. That vs. Which
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A Better Flu Shot
Heavy Sleep
A Long Haul
Invertebrates
Horseshoe Crabs
Praying Mantis
Grasshoppers
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Black Bear
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Great Danes
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The Surprising Meaning and Benefits of Nursery Rhymes
What Not to Say to Emerging Readers
Children and Media
Physics
Project Music
One ring around them all
Powering Ball Lightning
Plants
Tracking the Sun Improves Plant Pollen
A Change in Leaf Color
Flower family knows its roots
Reptiles
Copperhead Snakes
Reptiles
Caimans
Space and Astronomy
Slip-sliding away
Unveiling Titan
A Whole Lot of Nothing
Technology and Engineering
Spinach Power for Solar Cells
Supersuits for Superheroes
Shape Shifting
The Parts of Speech
What is a Verb?
What is a Noun
Adjectives and Adverbs
Transportation
Morphing a Wing to Save Fuel
Charged cars that would charge
Robots on a Rocky Road
Weather
Polar Ice Feels the Heat
Earth's Poles in Peril
A Change in Climate
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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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