This study is aimed to identify the effects of task complexity on first language (L1) use and the functions it may serve when two groups of learners of English as a foreign language (EFL) work on collaborative tasks. Twenty-four pairs of Chinese EFL learners from two universities were assigned to a lower-proficiency and a higher-proficiency group,…

The involvement load hypothesis (ILH), which predicts the lexical learning potential of tasks, assumes that writing sentences (SW) and compositions (CW) using novel target words (TWs) lead to similar lexical gains. However, research on the issue is scarce and contradictory. One possibility is that the higher cognitive load of CW hinders learning…