This question already has an answer here:

Is my analysis correct that the following use of wh- question words and how is two clauses linked by a conjunction:

I don't understand || how/why/when/where he did it
here's || why I have a problem

Furthermore are these to be considered textual themes, while in

I don't know || what he did
I don't know || where he did it
I don't know || who did it

what, where and who would be ideational themes?

marked as duplicate by Edwin Ashworth, David, J. Taylor, Nigel J, Skooba May 11 '18 at 15:40

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    I suggest you delete the second part of your post and ask it as a separate question, including what resources you have used in an attempt to answer it yourself. – Shoe May 5 '18 at 11:12
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    What is SFL? Please edit to explain. – curiousdannii May 5 '18 at 13:08
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    Thanks for your help, the clause boundaries issue is certainly tackled in the other post. The other question relates to the composition of themes (the first meaningful element in a clause) in systemic functional linguistics. – Elliot O'Sullivan May 5 '18 at 15:26
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    Why would you want to learn functional grammar, a confused meaning-based mish-mash based largely on Michael Halliday's thinking? – BillJ May 5 '18 at 18:23
  • @BillJ. To reduce functionalism to "a confused meaning-based mish-mash" does it a considerable disservice. Whether one considers formalism and functionalism as antagonistic rather than complementary, it does strike me as odd to call into question the desire to learn about functional grammar. – Shoe May 9 '18 at 7:37