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Is “data” singular or plural?

I often see the word “data” used in different ways. Some people say “the data is,” while others say “the data are.” It’s a bit confusing—so is “data” actually singular or plural, and which one should I use in modern English?

What’s the real difference between ‘say,’ ‘tell,’ and ‘speak’?

What’s the real difference between ‘say,’ ‘tell,’ and ‘speak’? I often get confused about when to use each of them in sentences. For example, sometimes people say ‘He said something,’ and other times ‘He told me something,’ or ‘He spoke to me.’ They all seem to mean ‘to talk,’ but the grammar and meaning change. Could you explain how to use them correctly with examples?

Way to speak English fluently

What is the best and most effective way to speak English fluently and confidently like a native speaker? I’ve been learning English for a while, but I still hesitate when speaking. Should I focus more on grammar, vocabulary, or pronunciation? And how can I practice speaking English every day, even if I don’t have anyone to talk to?