The results showed that for the proficient Chinese-English bilinguals, the reaction time was shorter and the error rates were lower in non-switch condition. Typical language switching cost was found in both experiments. Furthermore, proficient bilinguals showed shorter naming latencies with their weaker language (English) than with their dominant language (Chinese) in switch condition. However, the switching costs of phrase with quantifier were not significantly different from that of phrase

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... hout quantifier. This means that the grammatical pattern and/or syntax did affect the processing of language switching but did not affect the switching cost. It is claimed that in phrase level, even the proficient bilinguals choose the mechanism of inhibition control to complete the process of word. Therefore, the asymmetry of switching costs appeared without surprise. As language information did not affect the language switching cost in phrase lexical level, we can conclude that the switching cost does not come from the word -recognition system itself but is caused by processes outside the lexicon associated with task performance.