Conditional Indicators

Question 1

Indicators that introduce sufficient conditions

Answer 1

if
when
whenever
every
all
any
each
in order to
people

Question 2

Indicators that introduce necessary conditions

Answer 2

then
only
only if
the only
must required
precondition
unless
except 
without
no
none
never
not both
cannot

Question 3

Translation mechanism:

unless, until, without, or, and except

Answer 3

1. pick one idea → negate → make sufficient condition

2. remaining idea becomes necessary condition

Question 4

“Only” and “Only if”

Answer 4

directly precedes the necessary condition

Question 5

“The only”

Answer 5

directly precedes the sufficient condition

Question 6

What is the translation for [X] requires [Y]?

Answer 6

X → Y

Question 7

“No” at the beginning of the sentence

Answer 7

modifies the necessary condition (typically, the second idea: Do not make the mistake of thinking “no” modifies the word directly next to it).

Question 8

Translation mechanism:

no, none, not both, never, cannot

Answer 8

1. pick one idea → negate → make necessary condition

2. remaining idea becomes sufficient condition

Question 9

Two usages to form grammatical sentences with “the only”

Answer 9

(1) The only X’s (insert modifiers) are the Y’s (insert modifiers)—Y’s must point back to the X’s.
(2) Y’s (insert modifier) are the only X’s (insert modifier)— X’s must point back to the Y’s.

Translation: X → Y