The Theme of the clause is:
the element that serves as the point of departure of the message.
It is the Theme that helps us organise the clause as a message. Everything else is the Rheme. In English, the Theme is the first part of the clause, such as this example from H&M (p.90):
The duke
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has given my aunt that teapot.
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Theme
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Rheme
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The Theme can be identified as:
the first group or phrase that has some function in the experiential structure of the clause, i.e. that functions as a participant, a circumstance or the process
(H&M,p.90)
These are called topical Themes. Whatever follows the topical Theme is the Rheme.
Where
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shall I put the pot?
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Put
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the pot on the table.
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I
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put the pot on the table.
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On the table
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I put the pot.
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Did you
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put it there?
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Let’s
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leave the pot there.
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Theme
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Rheme
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More correctly though, the topical Theme marks the end of the Theme. It might also be the case that there are other elements that come before the topical Theme. We might want to foreground our opinions or feelings about the topic, in which case we might use an interpersonal Theme, or we might want to link to some other message, and so use a textual Theme. This cartoon from Footrot Flats is a good example of an extended multiple Theme:
NO = Textual Theme
REALLY = Interpersonal Theme (modal adjunct)
HORSE = Interpersonal Theme (vocative)
THIS LITTLE GUY = Topical Theme
Now that we can identify a topical Theme, the next element is the Rheme:
IS MY COUSIN MIGUEL FROM CHIHUAHUA = Rheme
In extended longer text, the Theme also enables us to repackage discourse as a message. We can see this in the author bio for Murray Ball, where the preceding passage is repackaged into the following Theme (underlined):
…for a while it seemed that his cartoons would serve only to agitate – All this changed in the mid-1970s