Use roots and prefixes to rebuild a word
Many science words are built from a few parts you can learn once. Sub- and hypo- mean under, epi- means on or above, hydro- means water, bio- means life, -logy means the study of and -cide means killing. If the box shows sub and the sentence is about the ground below the topsoil, you are most of the way to subsoil. If it shows hydro in a sentence about dams, think hydroelectric.
- Right:Hydroelectric dams turn moving water into electricity.
- Right:Biology is the study of living things.
- Not:A hydrologist studies the history of rocks.Instead:A geologist studies the history of rocks.
- Not:Farmers spray insecticides to kill weeds.Instead:Farmers spray herbicides to kill weeds.
Learn the words that go together
Academic English has fixed partners, called collocations. We conduct research; we never make it. A factor plays a role; it does not do one. A long dry spell is a prolonged drought, and we speak of heavy rain, not strong rain. When two words both seem to mean the right thing, the partner decides. Learn the pair, not the single word, and the second half of the phrase will come back to you in the exam.
- Right:The team conducted research on coral reefs.
- Right:Sleep plays a key role in memory.
- Not:They made an experiment on plant growth.Instead:They carried out an experiment on plant growth.
- Not:The region suffered a lengthened drought.Instead:The region suffered a prolonged drought.
Count the letters and check the ending
In a half-word box each dash stands for one missing letter, so count them. val plus four dashes makes a seven-letter word: valleys fits, and valley is one letter short. Then check that the ending fits the grammar: a plural after many or several, an -ed verb for a finished past action, an adjective after is, and an -ly adverb before a verb. A word with the right meaning and the wrong ending still loses the point.
- Right:The river carved several deep valleys.
- Right:Over many years, the waves slowly wore the cliffs away.
- Not:Several shoreline in the state are eroding.Instead:Several shorelines in the state are eroding.
- Not:The new bridge was design to survive earthquakes.Instead:The new bridge was designed to survive earthquakes.
Watch for everyday words with an academic meaning
Some words you already know have a second, academic meaning, and the passage uses that one. A glacier retreats when its ice melts back, not when it runs from danger. In biology a culture is a group of cells grown on purpose. In physics matter is anything that has mass and takes up space. Desert animals shelter in burrows, using shelter as a verb. If an everyday word seems to make no sense, try its academic meaning.
- Right:The glacier has retreated almost a mile in the last century.
- Right:Solids, liquids and gases are three states of matter.
- Not:The glacier escaped two miles up the valley.Instead:The glacier retreated two miles up the valley.
- Not:Physics studies material and energy.Instead:Physics studies matter and energy.
Rule out look-alike words with the sentence
Many academic words share their first letters: prolonged and profound, endure and endorse, flourish and flounder. A half-word box shows only that shared start, so the letters alone cannot decide. The sentence has to. Ask what the word must mean here, then test each look-alike against it. A drought that lasts for years is prolonged; a change that reaches deep into how people live is profound.
- Right:The drought was prolonged, lasting four years.
- Right:The printing press had a profound effect on education.
- Not:The old stone bridge has endorsed for 800 years.Instead:The old stone bridge has endured for 800 years.
- Not:Several basics in the region are now dry lakes.Instead:Several basins in the region are now dry lakes.
Where this costs you marks on the TOEFL
The TOEFL has no separate vocabulary section, but academic words carry the Reading section. Reading has 50 items, and the Complete the Words task asks you to finish half-written words inside a short academic paragraph. Longer passages on topics such as biology, geology and history lean on the same words. A box left empty can never earn the point, and in our data nearly a third of missed boxes were blank. Listening uses the same families in academic talks, where you hear each word once with no letters to help. Practice the habits on this page, try them on real boxes in Complete the Words practice, and build each family with our word lists by topic.