6. Start with the pronouns
English is a pronoun based language: I, me, you, he, she, it, us, them.
With children you can use flashcards with pictures. Older students and adults will have written materials before, so the focus is getting them to memorize the words. For example, you could help them to create a pronoun chart.
Another essential set of words are the 5-Ws: who, when, where, when and why. Again, create a chart and get them using the words regularly.