New answers tagged ime
You want to type N-A-E-R to get 那儿.
I will elaborate on my comment above, as you wished. The main reason for this behavior of your IME software is that it is configured to make guesses about what you want to type. Since there are so many Chinese characters with the same pinyin initials and finals, it has to. But it also tries to save you from typing, so that you don't have to type out long ...
The basis of 那儿 is from spoken language, and the addition of the 儿 is an example of a phonetic element in Chinese language. The "er" is an approximation of the sound, and is similar in meaning and use to 那里。
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