How do compound sentences work?

i

Compound sentences consist of two, equal or balanced independent clauses, joined by a connective or conjunction. They are great for building arguments and linking ideas. They use theme and rheme to build cohesion across paragraphs.
Note: in a compound sentence, the clauses cannot be reversed in order.

Compound Sentence:	The probe	was placed	in the cylinder	and	then	it	was used	to measure the flow.
SFL description:	Participant	Process	Circumstance	Connective	Circumstance	Participant	Process	Circumstance
TG description:	Subject Definite Article, Noun	Finite Verb	Adverbial phrase of place Preposition, Definite Article, Noun	Conjunction	Signpost of time	3rd person singular Subject Pronoun	Finite verb (passive, simple past tense)	Verb in the infinitive plus Object (Definite Article plus Noun)
					(Note that these three elements, then it was, can be implied rather than written in full.)