This thesis examines some selective cases of morphophonemic alternation in Mandarin Chinese. It presents analyses of the function -of the retroflex suffix -r and describes several conditions for tone sandhi. The suffix -r functions not simply as a noun formative. Some of the suffixed forms have consistently different meanings from the roots on which they are based. The suffix -r also plays a role in poetry as a time-filler to make each line of a poem fulfill the requirements of the strict number of characters and rhyme. This thesis also explains what causes the tone pattern of words such as xiaojie and jiejie to be pronounced differently. These tonal changes are found to be related to the way in which a word is formed. Compounding, reduplication and suffixation differ with respect to how they effect tone sandhi. Tone alternations in actual speech are explored to determine how tone sandhi produces each pronunciation and how grammatical structure and other factors are relevant.

Over 13-weeks a control group (n=7) had all errors corrected, while an experimental group (n=9) had only article and sentence construction (run-on sentences, fragments, comma splices) errors corrected. Separating the two types of errors is essential, since the latter (representing grammar) are subject to theories of acquisition and the former (representing usage) are not. One-way analyses of variance ran on pretest versus posttest found no significant difference in either groups' article errors; however, the experimental group had significantly fewer sentence construction errors, implying that teachers should be sensitive to both the correction technique and error type; researchers should not combine the two error types in gathering data.