It's less about the grammar explanation and more about the examples and opportunities for practice. Even the best students will miss a point or two of the explanation. Even the best students won't be able to apply the language without practice. Consider the following:
1. Present the grammar with a short explanation. You don't need to produce grammarians.
2. Provide some examples on the board which show the target language.
3. Get a few more examples from students. Make any corrections if needed.
4. Drill the sentences. You can start with a choral drill and then move into a substitution drill. The main idea is to get students familiar with the target language and to improve answer time. (Many students have the answer in their head, but then take several seconds to translate, check, and say the sentence. Practice reduces this pause, and makes the answer more automatic.)
5. Set up a dialogue to see the language in context. You can pre-write the dialogue or generate one with the class.
6. Students practice the dialogue.
7. Allow students a final activity to use the language as naturally as possible. Q&A sessions are but one example. Retention improves when students are free to personalize the language, talking about topics/events relevant in their lives. In addition, they also have the opportunity to mix target language from past lessons.
A lot more can be said with a lot more detail. But I hope these ideas help.
Good luck.
Chris Cotter
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