I am the only native speaker at my college and the Chinese teachers often ask me quite tricky grammatical questions which I find difficult to explain. I think I need to study more grammar but it is useful for my future in the profession?

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Because if you don't label it you can't agree what you're talking about.I mean, sure, study language "as it is used in society". But why go to such trouble to label it all?
This applies to all of what you have picked up about English grammar or would learn on a linguistics course. It obviously applies to everything discussed on this forum.Do you mean to say, Stephen, that Halliday's stuff is something I should know, but not actually teach?
It is debateable how far humans can grasp anything without making up terminology. Many believe that language evolved not for communicative reasons but in order to structure thought.dubious statements which merely reflect, clumsily, what all human beings can grasp without making up terminology.
You're not even trying here! Theme and focus are precise linguistic terms. To confuse that with their non-technical uses is ignorance or laziness. In everday life people think of a television and not a knife as being a machine, but in mechanics it is the exact opposite, just as in mechanics the student who goofs off to play football is doing much more work than the one who stays in the class and pays rapt attention.Maybe theme/focus, but since those are near synonyms, that is a confusing way to do it (this movie has a completely different theme and focus. Eh?).
You certainly can't call it subject/verb. In the interchangeAs far as I can see, we all know that when speaking, we pick a topic, and give information about it. You can call that subject/verb. You can call that theme/rheme. Maybe theme/focus,
Why doesn't it say anything in English but does so in Spanish ('soy yo', incidentally would be used in all contexts where in English you would say "It's me" or "It is I"). It's definitely grammatical and not a set phrase. When we answer the telephone in English we say "It's John here," or "This is John speaking", whilst in Spanish we say"Soy Juan".Anyway, that's why we don't say "I am me" - it doesn't say anything. (Kindly explain when "soy yo" would be used in context!)
Because 'People' is a dummy subject. Exactly my point.Your statements about the passive are rather crude ones which can often be heard. However....
"They won't get away with it. Photos were taken!"
"They won't get away with it. People took photos!"
...are "about" one and the same thing, and perfectly interchangeable.
In other words you're stumped so your saying 'through convention' in the vain hope it won't be exposed as a cop-out. We do need to tell students that they can't say "What's it?" are "What're they?" (unless we put contrastive stress on the 'they'). As they are the only two examples to come to mind, it is rather easier to give them the 'weak' list than the practically infinite 'strong' list.As to "what's it" I suppose I would say that we avoid it through convention - not sure. However, your explanation suggests we not only need a "focus" - we need a "strong" focus. Do students receive a long list of those??
The relevance is clear; the source involved has produced a document, ostensibly for teachers, and has given a laughably false explanation because, like you, he prefers to roll his own explanations instead of actually studying the theory.As to "what's it" I suppose I would say that we avoid it through convention - not sure. However, your explanation suggests we not only need a "focus" - we need a "strong" focus. Do students receive a long list of those??