Here is a great article written by a teacher named Susan on the website, busyteacher.org
At times, language learning can be straightforward. Students memorize lists of vocabulary and rules for grammar. This type of thinking, though, isn\’t very complex. Recall and memorization only require surface level thinking. If you are teaching ESL to children, teaching critical thinking is particularly important because it will serve them in their futures no matter what language they are speaking. Teaching critical thinking, though, isn’t always easy. The following are some ways to integrate critical thinking exercises into your ESL lessons while still meeting the language goals you set for your students.