I don't have time now to spank you for your "insights" into the passive, but if SJ doesn't come back soon to do it I guess the pleasure will indeed fall to me.

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I merely suggested that doing so was not necessarily a sign of insanity. Just as I would not have anything against an EFL teacher in Papua New Guinea with a BMI between 18 and 23 wearing nothing else but nose rings and a *beep* gourd.By the way, on an exotic excursion into the Middle East forum, I noticed Stephen Jones defending the wearing of Arabic dress by western teachers.
Where did I ever say that not understanding theme and focus causes this problem. Your are the one who is suggesting the L2 learner should be given the metalanguage. It's called setting up a strawman argument.Soy yo then, as I suspected, means "it is me" and not "I am me" and the Spanish students are translating word for word. No Asian student has ever come up with "I am me", as I recall, so I don't think that it is the lack of a lecture on "theme" and "focus" that is the problem.
Still wrong. Look at this sequence.Subject/verb was lazy, I meant "verb phrase" or "complement".
The theme of the sentence is the Pope; the rheme or focus is 'was bitten by a cat'. What you're saying is meaningless anyway, even allowing for the fact you clearly have no understanding of the technical terms. A small shift in focus" from what. From the active?As to the passive, it merely signifies a small shift in focus. The sentence "The Pope was bitten by a cat" is not about the Pope. It is about the pope, a cat, and no less, some biting. That's why "The Pope was bitten" probably means something else.
The thread was started by someone asking about whether it is a good idea to have an MA course in TEFL or applied linguistics without any modules dealing with descriptive linguistics. You are the one who decided to change that into an attack on Halliday whom you scarcely seem to have read or heard of.Is that something enough to make it worthwhile kicking an MA off with "functional" grammar (another dubious piece of terminology!) though?
The point is that the OP was talking about a course where even the basics aren't there. And you seem to be confusing the basics of linguistics with whatever you can remember from your schooldays.Transformational grammar also teaches us things, but I suggest that it isn't needed on the MA course beyond the very basics.
'Prawn', aka 'Ludwig', aka 'Zero Hero' is a believer in systemic-functional linguistics. Not obscure and although I don't have time for more than a superficial acquaintance that does not mean a lack of respect.There are also other more obscure grammars out there, such as the one "Prawn" advocated on this forum, and Stephen Jones had no time for.
So, to sort out that problem, you suggested bringing up "theme" and "focus" with the students. Play fair.And 'theme' and 'focus' are absolutely central concepts. They make explaining the passive easy. Picasso painted 'Guernica' is a sentence about Picasso. 'Guernica' was painted by Picasso is a sentence abut Guernica. Moreover it makes it clear why 'They've cooked dinner' cannot be transformed into *Dinner has been cooked by them.
Moreover they come to the rescue in hidden ways. Plenty of times people explain why we say 'me' in the phrase 'It's me' but it's only when you are teaching a Spanish speaker with a penchant for awkward questions that you are asked why we don't say *'I'm me'.
Something seriously wrong with your reading skills. Nowhere in what you quote did I suggest it is necessary to explain the terms to the students. Indeed I believe that a descriptive grammar that satisfies the needs of the teacher cannot satisfy the needs of the student and vice-versa.to sort out that problem, you suggested bringing up "theme" and "focus" with the students. Play fair.
Perhaps it might be an idea then if you got into the loop. It's hardly rocket science.Your comments regarding the "default" of the sentence and the "focus" origins of rising tones are also pretty meaningless to those outside the loop of this brand of grammar.
John is the focus, and as a result would have contrastive stressJohn is the focus. In such a case, dinner is the theme?
Not with you here at all: you seem to be confused. In a normal active sentence the agent and the subject are the same thing. I fail to see how the agent can be the object.If the theme can be the subject or the agent/object, what help is this?
I completely fail to see what you mean. In the sentenceWouldn't it be easier to say that if a human being is mentioned in the sentence, then only in exceptional circumstances are they not the active subject?
You may well emphasize your "special idea" by using the passive, but wouldn't it sound a bit odd? (That country you're from, you know, called) Greece has been invaded by Turkey!In other ways, the "functional linguistics" seems to have led us beyond the truth. You claim that each and every sentence has "theme" and "focus". However, if I charge into the room and say "Turkey has invaded Greece!", then all the information is new, and I will emphasize nothing. I may have no special idea what the "theme" should be - in which case I will go with the easiest structure - the active. If I do have a special idea - if I am talking to Greeks for example - then I may emphasize one, and make the sentence passive.