How to handle Supplementary Instruction of Subject-Deficient Students with language difficulties
assuming that this student met the English proficiency requirements of your school it is still common for esl students to fail courses due to language issues. this is due to the fact that they have to acquire the language of the course in addition to everyday English.

if you are willing you can try to accommodate this student through providing additional teaching and or additional time for assignments and assessments. 

from personal experience for a hard working esl student the second time through id always a charm. as their language skills improve the chances of repeating are drastically reduced.