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It only states that an instance of a requires an instance of b, but it doesn't specifically say that an instance of b requires an instance of a The main emphasis is on the result. That's why [a only if b] is sufficient to express the conditional statement [a → b].
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If only and only if are similar expressions that are used in different ways This form basically means the same as ' if' If only expresses a hope or wish
If only i had a real choice in the matter
She needed to get away from her job if only for a week == only if expresses a command or requirement He can stay on the team only if he completes his homework and improves his grades Never…except when.click for english pronunciations, examples sentences, video.
However, this usage of if and only if is relatively uncommon and overlooks the linguistic fact that the if of a definition is interpreted as meaning if and only if. A if b means that b implies a a only if b means that a implies b a if and only if b means that a is equivalent to b For example if in the morning i tell my wife i'll buy that shirt we saw yesterday only if it costs less than 40 dollars and she sees me wear it in the evening, she can deduce that i paid less than 40 dollars.
Only if is a conjunction which stipulates that what follows is necessarily and true
Its meanings include providing that, assuming that, and as long as Sentences with if and sentences with only if can essentially mean the same thing, but only if is a stronger phrase That is, the conditional aspect of the meaning is more emphasized and prominent. How to use only if in english grammar ' only if ' means ' only one condition happens