. AbstractLexical Approach put forward by Michael Lewis (1993) is widely acknowledged in EFL teaching and lexical teaching is very important development in the evolution of language teaching (Lowe, 2003). For about thirty years of teaching English as a foreign language (EFL) in China, more and more teachers have realized the importance of teaching and encouraging learners to use ready-made lexical chunks. However, the present study focuses on the overuse of lexical chunks in learners' writings in a high stake national test (College English Test Band 6 -CET6). The corpus-based data analysis will be done to find the most commonly used lexical chunks by Chinese EFL learners and demonstrate what is meant to be the overuse of lexical chunks. Furthermore, the reasons for misuse and overuse of lexical chunks will be discussed. The findings drawn from structural and functional analysis of lexical chunks also have some pedagogical implications.

Drawing on a sociocultural perspective of genre as a social action situated in a particular context, this study examined the functions and genres of four second-grade ESL (English as a Second Language) children’s English writing at home and at school. The two boys and two girls were born and raised in Canada, speaking English at school and with their siblings, and Cantonese at home with their parents. A total of 67 pieces of school writing and 54 pieces of home writing were collected over a five-week period. Findings show that home writing exhibit a wider range of functions and genres than school writing. The study suggests that teachers should be aware of the value of the writing opportunities and contexts bicultural children have at home and, therefore, incorporate such home experiences into classroom teaching to enrich the process of literacy development.

In the current context of economic transformation and a complex environment, increasing economic policy uncertainty may lead to deviations in corporate green behaviour, and it is particularly important to correct such deviations. On this basis, this paper empirically analyses the impact of economic policy uncertainty on corporate green behaviour bias based on statistical data of Chinese listed companies from 2007 to 2019. We find that economic policy uncertainty inhibits corporate green technology innovation but increases corporate innovation as a whole. Using the mechanism test, it was found that the internal inducement is mainly due to the prominent financing problems and limited development ability under the influence of uncertainty. After carrying out a heterogeneity test, it was found that economic policy uncertainty causes enterprises to deviate from green technology innovation more significantly in state-owned enterprises and protected industries, while this effect is significantly reduced when firms face fierce product market competition. Furthermore, strengthening executives’ power and implementing incentive mechanisms can more effectively correct the deviation. This study provides empirical evidence with which to strengthen corporate green innovation practices.

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