Hello Godo,
I can attest to the language-challenged student. If there is a language barrier, it can truly make things challenging for the student, however, I have found for the language-challenged student, he or she tends to really focus on the concepts being covered. It appears that the student is listening very hard because of the challenge. I have four of these students this module. I've determined that I listen very hard as we are conversing, therefore, it can be challenging for the student as well as the instructor. I too generally have more one-on-one with this type of student. I also have noticed that the language-challenged student likes to hang around to converse with the instructor after class is over.