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ying someuseful suggestions for teachers. English teachers can grasp the difficulties of English dentalsand alveo-palatals for the children, and help them find methods to avoid the pronunciationerrors.
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2 Literature Review

2.1 Theoretical Foundation
The first language makes some positive or negative influences by which the secondlanguage acquisition is strongly interfered; these are believed by linguists. According to Odlin(1989: 27), transfer is the influence resulting from similarities and differences between thetarget language and any other language that has been previously (and perhaps imperfectly)acquired. During the process of acquisition, pronunciation errors can be seen frequently. Here,“transfer” describes the carryover of previous performance or knowledge to the subsequentlearning (Brown, 2001).Odlin (2001: 89) points out that “the interference of L1 can be positive and negative,interference implies no more than negative transfer, which is contrast to the positive transfer. ”If the second language and the first language have some similarities, positive transfer willoccur and make the acquisition easier; inversely, negative transfer occurs and causes errorsbecause of the differences of two languages in the process of acquiring the second language.Ellis (1985:19) pointed out that the clearest support for Language Transfer Theory “comesfrom ‘foreign’ accents in the L2 ”.
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2.2 Previous Studies on L2 Speech Sound Acquisition
In recent years, more and more people begin to realize the importance ofpronunciation of foreign language in the process of teaching and learning. Till now, numerousresearches of the second language speech sound acquisition have been implemented by theinternal and external scholars. Among them, the researches of English speech soundacquisition are an important part of it. It is well known that English and Chinese are twodifferent kinds of languages. They belong to the different language families. As a result, thedifferences of them will lead to the influence of English speech sound acquisition. It is well known that most of the current speech sound researches about the secondlanguage acquisition concern the phonological transfer studies, segmental studies; acquisitionmodels, teaching and learning process, relationship between perception and production, andnon-linguistic considerations (Leather, 1999; Major, 1998).
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3Contrastive Analysis of English Dentals, Alveo-palatals..... 16
3.1 Generalization ....... 16
3.1.1 RP System ......... 16
3.1.2 Putonghua.... 16
3.2 Phonetic Description of English Dentals, Alveo-palatals... 16
3.2.1 English Dentals and Alveo-palatals ...... 17
3.2.2 Chinese Consonants ...... 18
3.3 Similarities and Differences between English Dentals........ 18
4 Research Methodology of English Dentals and Alveo-palatals...... 19
4.1 Research Purpose ........ 19
4.2 Research Subject ......... 19
4.3 Research Material........ 19
4.4 Research Process ......... 204
.5 Data Collection...... 21
5 Results and Discussion of Acquisition of English Dentals........ 23
5.1 Results of Recording ......... 23
5.2 Results of Interview .... 31

5 Results and Discussion of Acquisition of English Dentals andAlveo-palatals by Chinese Children

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