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<< tte ba | uchini-2 >>

うちに [うちに] (uchini)
    Meaning: while; during; as
    Example: みるみるうちに太った。/ He gained weight just while I was watching him.
    JLPT Level: 2
    Category: grammar
    Author: dc

  [ Edit This Grammar Entry ]
うち (内) means inside. so this is "inside the time" or while. 
I found this helpful:
うちに indicates a period of time WITHIN WHICH an action occurs, and corresposnds to English "while still", or in negative constructions "before".

It is different to あいだ, which indicates a period DURING OR THROUGHOUT WHICH an action occurs, and is equivalent to English "while".

Study hard while you are still a student.

Different to: 学生の間に、いろんな所を、旅行するつもりです。 I plan to travel to lots of places during the time I am a student.

うちに is also used to indicate an event building up or reaching a climax AS some action is being done.

I grew tired as I listened to the teacher speak.
Another way to keep うちに and あいだ apart is:

うちに: An abstract timespan with diffuse start and end time; e.g. childhood, rainy season

あいだ: A timespan where you can pinpoint start and end time; e.g. lecture, summer holiday
amega furanai uchini uchihe detekudasai 

[ Add Note(s) ]
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ex #77   若いうちに本をたくさん読みなさい。 
While you are young, read many books.  
ex #3156   暇なうちに、遊びに来てください。 
While you are free, come here and play with me please.  
ex #3159   暗黙のうちに承諾する。 
Accept implicitly.  
ex #3160   みるみるうちに太った。 
He gained weight just while I was watching him.  
ex #6182   どうぞ、熱いうちに、食べて下さい。  
Please go ahead and eat it while it's still hot  
ex #6184   学生のうちに、よく勉強しておきなさい。 
Study hard while you are still a student .  
ex #6186   先生の話を聞いているうちに、眠くなってきた。 
I grew tired while I listened to the teacher speak.  
ex #6902   ふるさとの母から届いた手紙を読んでいるうちに、思わず涙がこぼれた。 
While I was reading the letter I had received from my mother old home, tears went up spontaneously.  
ex #6904   日本語を勉強して行くうちに日本に関する色々なことが分かって来た。 
As I am learning Japanese, I begin to understand various aspects related with Japan.  
ex #8548   時間があるうちに、やりなさい 
While there's still time, please do it.  

Help JGram by picking and editing examples!!
  See Also:  
    [ Add a See Also ]
    zioWouldn't #3156 mean something more like "please come visit whenever you're free". I'm not a native English speaker, but er, "come here and play with me" has kind of a wrong sound to it, doesn't it? 
    bi-ruYes it certainly sounds pretty weird in English. I think zio's translation is probably the most natural sounding translation of that sentence. 
    Miki暇なうちに does not mean "whenever you're free". "Whilte you are free" would be better. Just correct the latter part. 
    Miki#6183 Please change from これど to これで. 
    minutiaeWhoops! Bad typo. Thanks for alerting me to it. 
    karekoraisnt ex #6184 an example for the other 'UCHI NI' meaning 'before it stops'? 
    赤毛Minutiaeさん> Please correct the notes:
    勉強ひて->勉強して as in ex#6184.
    Why are they 2 different grammar entry うちに+うちに-2?
    In my point of view:
    One use of うちに describe a progressive change in the 2 clauses before and after うちに. This use is associated with progressive form of verbs like Vテ+行く(change in the future) and Vテ+来る(change in the past) or sudden change like Vイ+出す and Vイ+始める. In this use, うちに cannot be substituted by あいだに. These examples like ex #3160 are the best for uchini.
    The other use of うちに make an opposition between a temporary state in the clause before うちに which permits the clause after うちに, and the end of this temporary clause when it will be too late. This use should be in uchini-2 but there are various example here in uchini.
    I think it will be great to rearrange these 2 entry. So I moved Ex #6186 from here to #6903 of uchini-2 and I changed it with the example from the notes which fits better.
    tigertIs it just me or does 学生の間に seem a little unnatural? I cannot put my finger on it, but maybe if the sentence included the subject.

    僕が学生の間に 色々な所へ行くつもりです or maybe this is a good place for 時 or にを消したら? 

    僕が学生の間 色々な所に行くつもりです

    I don`t know what it is, but that example just doesn`t seem natural. 
    karekanoIn ex. #3160 【彼は】みるみるうちに太った。 Could be "He gained weight in the blink of an eye" too? 

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