English Immersion
Research
According to educational psychology author, Robert E. Slavin, the National Literacy Panel on Language-Minority Children and Youth (NLC) published a 2006 research development on English language learners. Their research concluded that on average, language minority students who were simultaneously instructed in their native language and in English did better on English reading comprehension measures than language minority students who were immersed in English.
August, D. and T. Shanahan eds. Developing Literacy in Second-Language Learners.
New Jersey: National Literacy Panel on Language Minority Children and Youth, 2006.
Cheung, A. and R.E. Slavin."Effective Reading Programs for English Language Learners
and Other Language Minority Students." Bilingual Research Journal 29.2 (2005): 241-267.
Slavin, Robert. Educational Psychology: Theory and Practice. 9th ed. pg. 110.
New Jersey: Pearson, 2009. Print.

Method A: Use words in the native language as synonyms for defining English words in vocabulary instruction.
Approach #1: Constructivist Vocabulary Lists
Approach #2: Bilingual Vocabulary Accordions
Method B: Provide group opportunities for ELL students to discuss English vocabulary in their native language.
These opportunities help ELL students test their English reading comprehension and practice their native language discussion skills simultaneously. Also, allowing ELL students to discuss English literature in the comfort of their native language will promote deeper, more critical thinking and questioning because students will not be worried about translation.
Caution: do not seclude ELL students from English-dominant students on every group activity done in the classroom. This could raise questions about labeling or discrimination. Though this method is helpful, it should be used in moderation.
Approach #1: Learning Through the Arts
Approach #1: Silent Reading and Summarizing in English
Approach #2: Silent Reading and Summarizing in the Native Language