Determining the Need for Conjunctions Between Clauses (KLA 403, 504)

Two independent clauses sitting side by side don't tell you how they connect. 'The trail was steep' and 'we finished early' are both true, but the reader needs to know if that's surprising or expected. 'And' claims simple addition. 'But' claims contrast. 'So' claims cause and effect. Swap one for another and the two true facts suddenly make a different point, even though neither clause changed. That's the job of a conjunction between clauses: it supplies a relationship that the clauses themselves stay silent on.

This is also why a conjunction isn't always needed. If one clause already announces the relationship, with a word like 'because', 'although', or 'since', adding 'so' or 'but' later just repeats the job. 'Because the ward was rebuilt, the station sits at the centre' already explains cause, so no second connector belongs after it. Check first whether the relationship is already stated before reaching for a conjunction to state it again.

Distance makes this harder to see. When a long descriptive phrase sits between two clauses, like a string of appositives describing an old organ, it's easy to lose track of whether the relationship has been given yet. Read past the description to find the actual second clause, then ask what logical link it needs. This skill sits right next to comma splices and run-ons: both problems come from misjudging what sits between two independent claims, whether that's nothing, a comma, or the wrong word.