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many people speak English but many make grammatical mistakes while speaking, for such people a course of grammar would be really helpful
Studying grammar should go together with a reasonable amount of controlled and freer practice as the Direct method suggests. Particular care should be posed during the controlled practice of the grammar structures that are being studied in order to avoid mistakes and fossilization in the speaking practice fase. For this reason I'd also suggest some correction on the spot when doing exercises and delayed error correction during the freer practice, when, as usual, we focus more on fluency.