about "only" and "until"

mz253
Posts: 319
Joined: Thu Mar 25, 2010 11:18 pm

about "only" and "until"

Postby mz253 » Wed May 26, 2010 11:54 am

hey, i know it must sound very stupid that i'm taking the june test but i don't know how these words work.

i wonder whether the following phrases are sufficient or necessary... (i will give my answer and can anyone help me correct?)

the only (ignore only, treat it as sufficient)
only if/only when (necessary)
until (necessary)

thanks!

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LSAT Blog
Posts: 1262
Joined: Mon Dec 07, 2009 9:24 pm

Re: about "only" and "until"

Postby LSAT Blog » Wed May 26, 2010 12:10 pm

the only = sufficient indicator

only if / only when = necessary indicator

until / except / unless / without = tricky indicator words


2 main methods for translating these tricky indicator words:

1. when you see these words, replace them with the phrase "if not"

2. take them as introducing the necessary condition (whatever immediately follows is the necessary condition), then take the other part of the sentence, negate it, and then that part will be the sufficient condition


for example:

"No X until Y" can be translated...


Using Method #1:

No X if not Y = If not Y, not X


Using Method #2:

If X -> Y

I personally prefer the 2nd way, but both are perfectly valid ways to deal with these annoying words.



Hope this helps,

Steve
Last edited by LSAT Blog on Wed May 26, 2010 12:11 pm, edited 1 time in total.

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HiLine
Posts: 210
Joined: Thu Dec 31, 2009 11:57 am

Re: about "only" and "until"

Postby HiLine » Wed May 26, 2010 12:10 pm

I am going to intentionally choose A as the necessary condition for each of the following explanations:

A is the only case where B could happen --> A is necessary
B happens only if A happens --> A is necessary
B does not happen until A happens --> A is necessary

mz253
Posts: 319
Joined: Thu Mar 25, 2010 11:18 pm

Re: about "only" and "until"

Postby mz253 » Wed May 26, 2010 1:21 pm

thank you!




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