Is this correct grammatically? and is the connection between the sentences correct?
You can also improve your English by watching TV shows and films in English, and by listening to the radio. This will help you understand different British accents.

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Aside from what teacher Tom has already stated, I don't find any other errors. You're sentence is coherent and understandable if you just correct that teeny tiny word (this ➡️ these). Congrats!

Answer

Grammatically each sentence is good.

To connect the two better, you might say "This approach" instead of "this" or "These media" or "These English programs" would be better. "This" on its own is singular and since you have listed three sources (TV, films and radio), it is a little confusing what "This" on its own refers to.

But in conversation or informal settings, "this" is probably good enough for most English speakers. I hope that makes sense.

Đừng bỏ lỡ cơ hội học ngoại ngữ ngay tại nhà. Hãy xem danh sách các gia sư ngôn ngữ giàu kinh nghiệm của chúng tôi và đăng ký buổi học đầu tiên ngay hôm nay!