Which approach is best for increasing comprehensibility of instruction for nonnative English-language learners?

Offering bilingual instruction while teaching English is the most effective approach for increasing comprehensibility of instruction for nonnative English-language learners. This method supports students in understanding lesson content by leveraging their native language alongside English. It enables students to make connections between familiar concepts in their native language and new material being introduced in English, facilitating a deeper understanding of the subject matter.

This approach not only aids comprehension but also helps in maintaining the students' cultural identity and linguistic skills in their native language. It also allows for a gradual transition as students improve their English proficiency, reducing anxiety, and increasing their confidence during instruction.

The other methods, while they may have certain benefits, fall short in addressing the comprehension needs of nonnative speakers. Solely teaching in English may leave students struggling with important content due to language barriers. Providing instruction only in students' native languages can hinder their English language development, which is crucial in a predominantly English-speaking educational environment. Utilizing visual aids as the primary resource can enhance understanding to some extent, but it does not foster the necessary language development and contextual learning that bilingual instruction offers.