Thyab, R.A. 2023. Most Common Grammatical Mistakes Made in English by L1 Arabic LearnersRobert Lado (1957), as well as most contrastive linguists, have shown that the learner’s first language may have a big role to play in the process of second language learning. Due to di. JOURNAL OF LANGUAGE STUDIES. 2, 4 (Aug. 2023), 49–62. DOI:https://doi.org/10.25130/jls.2.4.3.