Known or New: Identified vs. unidentified article use

PREVIOUSLY MENTIONED	DEFINED BY ANOTHER MODIFIER	SHARED KNOWLEDGE
Use "the" if the noun is mentioned: in an earlier sentence or paragraph as part of an item already introduced	Use "the" if the noun is defined by: a word (a proper noun) or determiner (this, that) a prepositional or adjective phrase a modifying clause	Use "the" if both listener and speaker: know the one (the car we both own) see the one (the book we are looking at) culturally know the one (the post office) or it is unique (the earth, the boy's mother)

PREVIOUSLY MENTIONED

DEFINED BY ANOTHER MODIFIER

SHARED KNOWLEDGE

Use "the" if the noun is mentioned:

in an earlier sentence or paragraph

as part of an item already introduced

Use "the" if the noun is defined by:

a word (a proper noun) or determiner (this, that)

a prepositional or adjective phrase

a modifying clause

Use "the" if both listener and speaker:

know the one (the car we both own)

see the one (the book we are looking at)

culturally know the one (the post office)

or it is unique (the earth, the boy's mother)

Review if needed: Article Summary

#	YOUR RESPONSE	CHECK ANSWER
1.	new airport in Tenerife had problems with its baggage system.
2.	Airport workers had a problem with conveyor belts.
3.	electricity had to be turned off while they fixed the problem.
4.	electricians had to be called in to assist.
5.	Most problems with baggage equipment seem to involve program error.
6.	However, problem in this situation was a backpack caught in the machinery.
7.	In this case, problem was that . . .
8.	the owner of backpack had forgotten to close it well.
9.	One of straps had gotten caught.
10.	worker had to cut the strap out of the gears.

back pack

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