IELTS language bank: Cause and Effect

Cause-and-effect language sits at the centre of Task 2 argumentation (almost every body paragraph has to explain why a phenomenon occurs or what it results in) and of Speaking Part 3 (examiners routinely ask "why do you think that happens?" or "what effect does this have?"). The single most common weakness examiners note is not grammatical error but repetition: a candidate who uses "because" for every cause and "so" for every effect across a four-paragraph essay is demonstrating a narrow range, even if every sentence is accurate. A second, more serious weakness is overclaiming causation: treating a loose correlation as if it were a proven, direct cause. This article works through phrases for stating a cause, phrases for stating a result, phrases for describing a chain of causes, and the subtle differences between near-synonyms that are too often used interchangeably.

Introducing a cause with a preposition phrase is the most compact option, and there is real variety available beyond "because of." "Due to" is neutral and works in most registers: "Due to rising fuel prices, many households have cut back on non-essential travel." "Owing to" is slightly more formal and slightly less common in speech, so it reads well in a Task 2 essay but would sound a touch stiff in Speaking: "Owing to a shortage of qualified staff, the clinic has had to reduce its opening hours." "As a result of" is longer but very safe and works equally well in writing and speech: "As a result of the new legislation, manufacturers must now disclose their emissions data." "On account of" is a more old-fashioned formal option, useful for essay variety but worth using sparingly: "On account of the region's unpredictable rainfall, farmers have diversified into less water-dependent crops." "In light of" introduces a cause that is being used as a basis for a decision or judgement rather than a pure physical cause, so it pairs naturally with recommendations: "In light of these findings, the government has revised its guidelines."

A second group of cause phrases uses a verb rather than a preposition, which lets the cause sit inside a fuller clause instead of a noun phrase. "Stem from" suggests an underlying, often less visible origin: "Much of the current unrest stems from long-standing economic inequality." "Arise from" is close in meaning but slightly more neutral and common in academic writing: "These difficulties arise from a fundamental mismatch between supply and demand." "Be attributable to" is a formal, almost technical way of assigning a cause, often used when a writer wants to sound cautious or evidence-based: "The decline in bee populations is largely attributable to pesticide use." "Be rooted in" carries a slightly more emphatic, sometimes historical tone: "Much of the debate is rooted in a disagreement about the proper role of government." "Originate from" or "originate in" work well for describing where a trend or practice first began: "The custom is thought to have originated in agricultural communities several centuries ago."

For stating an effect or consequence, the plainest options are "as a result," "consequently," and "therefore," all of which sit at the start of a new sentence and point back to something already stated. "As a result, fewer young people are choosing to enter the profession." "Consequently" is slightly more formal and works well in an academic-register Task 2 essay. "Therefore" leans towards a logical conclusion rather than a real-world outcome, so it fits better in an argument ("Therefore, this policy is unlikely to succeed") than in a description of a physical event. Beyond these three, verb-based options give more flexibility inside a sentence: "lead to," "result in," "give rise to," and "bring about." "Lead to" is the most neutral and all-purpose: "Prolonged screen use can lead to disrupted sleep patterns." "Result in" is very close in meaning but slightly more formal: "The merger resulted in the loss of several hundred jobs." "Give rise to" often introduces something more abstract, such as a debate, a concern, or a new phenomenon, rather than a concrete measurable outcome: "The technology has given rise to serious questions about data privacy." "Bring about" is frequently used for a change that required effort or is viewed positively: "Sustained public pressure eventually brought about a change in the law."