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The question is about modals, passive voice and phrasal verbs. It's rather difficult for students to put them into practice. They are confusing to differentiate 'could, may, might' and 'must, should, have to' because they are similar in meaning. I like the way the information is presented. The best way is to analyse the structure of the modals with the examples and to practice the material in context, not just to study the grammar reference book but to make up conversations, interviews, vary situations like between a doctor and a patient. Before practicing passive voice students should remember the formation: the verb to be and the past participle of the main verb and they should study the cases of the usage: the agent is unknown, is not important and when we needn't identify him or her. Phrasal verbs is an inseparable part of our speech as they make it more vivid. The only way to memorise phrasal verbs is to learn them in context.