“…Adopting the general grit scale, recent empirical research revealed that grit can be a crucial predictor of language learning outcomes such as motivation, emotions, willingness to communicate, and language achievement (e.g., Khajavy et al, 2021 ; Lan et al, 2021 ; Li and Dewaele, 2021 ; Liu and Wang, 2021 ). However, using the domain-general scale in a domain-specific field can bias the construct validity and predictive validity ( Teimouri et al, 2021 ). One, for example, can be a gritty person regarding overall learning except for foreign language learning simply due to its lengthy process of memorizing a large amount of vocabulary and grammar.…”