Grammar and verb tense are a struggle enough in your native language, so how is it the student is to learn a second language.  Spanish being the most common for students to take, second to Japanese (at least in SSS), you may want to focus on Spanish when developing strategies that will help the students be able to become fluent in the language.

http://www.studygs.net/langlearn.htm

http://www4.ncsu.edu/unity/lockers/users/f/felder/public/Papers/FLAnnals.pdf

http://www2.gsu.edu/~wwwrld/6429.html

Watch the video on Advanced Organizers and see how you can apply it to tutoring,

 http://study.com/academy/lesson/advanced-organizers-in-the-classroom-teaching-strategies-advantages Links to an external site.