Where it appears in the exam
What is it?
Cause-effect linkers say that one fact explains another. Some introduce the cause (because, since, as; because of, due to, owing to) and some introduce the consequence (so; therefore, consequently, as a result; so… that, such… that). At B2 it is not enough to know which side is the cause: you need to know what each linker allows after it — a conjugated verb, a noun, or a new sentence — and which way it points.
Why it matters in the exam
It is one of the most tested relations in the Open Cloze: so, as, since, because, result and due are among the most repeated Part 2 answers. In Part 4, the key words DUE, RESULT, BECAUSE, SO and SUCH force a switch from conjunction to preposition or from so… that to such… that. And in Writing, therefore and consequently are the pieces that make an essay argue instead of list.
The cognitive trap
"Your instinct: reaching for 'because' whenever there is a reason, and treating 'so that' as a longer 'so' — "The match was cancelled because of it rained.""
Why your brain does this: comprehension only needs to know that A explains B, and every cause word delivers that. The brain stores 'because' as THE cause word and 'so' as THE consequence word, and never learned to check what comes after them.
"because of the rain" ≠ "because it rained" ≠ "It rained, so…" ≠ "It rained. Therefore, …" ≠ "such bad weather that"
The rule: every cause linker imposes a different structure — preposition + noun (because of, due to), conjunction + subject + verb (because, since, as), comma + so + clause, or full stop + therefore + comma. And so that is not a long form of so: it is a different relation (purpose). Choosing by meaning puts the right word in the wrong place.
Recognition pattern
In the exam, look for the key signal first. The answer follows.
Signals that decide the linker
"___ to the strike, no trains ran." → 'Due' / 'Owing'
"It was late, ___ we went home." → 'so'
"Sales fell. As a ___, the shop closed." → 'result'
"The road was icy. ___, the bus was late." → 'Therefore'
"___ it was late, we went home." → 'Since' / 'As'
"It was ___ cold that the lake froze." → 'so'
"It was ___ a cold day that the lake froze." → 'such'
"because it rained" → "due to the rain" / "as a result of the rain"
Mistakes Cambridge exploits
"The match was cancelled because of it rained."
A conjugated verb after a preposition. It happens when because of is learned as a 'more formal' because and used the same way: with because of you either switch to a noun (the rain) or go back to because (because it rained).
"The match was cancelled because of the rain."
Because of + noun. The preposition demands a noun.
"It was raining, so that we stayed in."
So that = in order that: it turns staying in into an intended purpose, which is not what the sentence says. A consequence that happened → so; an intention → so that.
"It was raining, so we stayed in."
So = as a result. The second half is a fact that followed from the first.
"The tickets were such expensive that we didn't go."
Such does not go with a bare adjective: it demands a noun (such expensive tickets that). The pull towards such comes from languages where the same intensifier serves adjectives and nouns alike.
"The tickets were so expensive that we didn't go."
So + adjective + that. The degree of an adjective is marked with so.
"The shop closed, therefore many people lost their jobs."
A comma cannot join two complete clauses with therefore in the middle: it is a run-on sentence, the same fault as with however. Semicolon or full stop; never a comma alone.
"The shop closed. Therefore, many people lost their jobs."
Full stop before, comma after. Therefore heads a new sentence. A semicolon works too: "The shop closed; therefore, …".
Why your brain gets it wrong
The learner's short circuit
Analyse the trap by exam format
The concert was called off 4 the singer's illness, and tickets will be refunded next week.
Your brain reads 'it was called off because the singer was ill' and offers the default cause word: because. The meaning fits perfectly. But after the gap comes a noun phrase (the singer's illness) and no verb: because, since and as are conjunctions and need subject + verb. The only preposition among the four is due to.
Four causes, one preposition
Cambridge is not testing whether you know what a cause is: you have known since A1. It tests whether you tell conjunction from preposition when all four options mean the same.
Strategy
Before looking at the options, look at what follows the gap. A conjugated verb? → because / since / as. Only a noun? → due to / because of / owing to. Two seconds, and the decoy disappears.
Hardly anyone signed up for the evening course, ______ the college decided to cancel it.
You see two facts joined by a cause relation and write the most automatic cause linker: because. But because points backwards — it presents what follows as the CAUSE — and here what follows the comma is the consequence: they cancelled the course BECAUSE nobody signed up, not the other way round. The order fixes the direction, and the order asks for so.
the college decided to cancel it
The consequence comes AFTER the comma → so. Write because and you are saying nobody signed up because it was cancelled.
→ so
Cause and consequence have a direction
This is not a vocabulary error: it is a meaning error. A cause linker does not just join two facts; it says which one explains which. Putting because where so belongs turns the world upside down, and Cambridge counts it as zero.
Strategy
Read both halves and ask which one happened as a consequence of the other. If the one after the gap is the consequence → so. If it is the cause → because / since / as.
The weather was so bad that the ferry didn't sail. (SUCH) It was ______ the ferry didn't sail.
You swap so bad for such bad weather — correct — and the brain adds an article, because 'a bad weather' feels like any other noun phrase. But weather is uncountable in English, and such + uncountable goes without a. One extra word, and Part 4 scores the whole answer as wrong.
SUCH
such + a/an only with a singular countable noun (such a long day); with an uncountable, such stands bare (such bad weather, such good advice)
→ such bad weather that
The key word changes the structure, not just the word
Going from so … that to such … that is the consequence transformation par excellence, and it forces you to build a noun phrase. Into that noun phrase slips the article that English forbids with uncountables: the linker is right and the answer is lost all the same.
Strategy
With SUCH, write the noun first and ask whether it is countable. Weather, advice, information, traffic, furniture: no article. Then count the words: such bad weather that is four.
Linking Cause-Effect is 1 of 82
The exam tests 82 grammar competencies across 19 families. Mastering one is the first step. Automating all 82 is passing.
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