If one is accustomed to doing something, it's often said in English that they are "used" to doing it. However, why do we use "used" in this way? It doesn't seem to bear much relation to the simple past tense of "use"; does it nevertheless originate from the word "use" or a different word which has come to be spelt the same as the past tense of "use"?
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It may come from the (largely archaic) sense of use the noun meaning habit; 'It is his use to do so' is not uncommon in Shakespeare, and custom and use is good legal justification in certain circumstances (I don't at present feel inclined to revisit the question whether there is a difference between the two words). Interestingly, there is a line in Twelfth Night, "How use doth breed a habit in man!", which may indicate a gradual line from one use, to common use, to use/custom, to habit. But this is largely speculation.
It's not the meaning of the word used (pronounced [yuzd]) that's the problem. It's the meaning and usage of the two idioms spelled "used to", pronounced ['yustə], and never pronounced [yuzd tu].
The first idiom, which is the one you cite, is actually "(be) used to"; it's a predicate adjective construction, and therefore needs an auxiliary be, which holds the tense morpheme. "(Be) used to" takes a human subject, and refers to that subject's level of familiarity with something.
The other idiom is a true verb and thus requires no auxiliary verb, but its tense is fixed (past) and can't be changed. Also, there's a spelling problem with rules like question formation and negative formation that require Do-Support.
This idiom has a very complex meaning. X used to VP asserts that X VPed for some time in the past, and presupposes that X no longer VPs Thus,
whereas, by contrast,
As to why "used" is used this way, it really isn't.
Native speakers don't feel that these idioms are connected with the verb to use. That's why we don't say things like
which would require the normal [yuzd ... to] pronunciation, instead of saying
which keep the [yustə] pronunciation that identifies the idioms.
protected by Hugo Jul 25 '12 at 21:30
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