Perhaps, students need to be taught the basic rules and sample sentences for each rule, then proceed to applying the rules in contextual sentences. Further, students can carry out a role-play by putting into practise what they have learnt. As enrichment, students can be asked to write an essay or based on any topic using the particular grammar learnt. A hands on approach is vital in familiarising students with what they have learnt.
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There is no one right method. Different techniques have different benefits and drawbacks, and work better or worse in different concepts or for different students. If there were one single "right" method for teaching, there wouldn't be a huge field of ongoing research on language pedagogy.