Latin 'pater,' Greek 'patēr,' Sanskrit 'pitṛ,' and English 'father' are all words for 'father' and look similar. What makes this group of words evidence for a shared ancestral language rather than simply coincidence or borrowing?
AThe words are similar enough to suggest speakers once lived near each other and borrowed from each other
BLatin p consistently corresponds to English f across dozens of other word pairs, forming a systematic pattern that cannot be coincidence
CAll four languages have written records long enough to trace their histories back to the same source
DThe words share the same meaning, which is the primary criterion for determining language relatedness
A single similar word pair could be coincidence or borrowing. The diagnostic evidence is systematic sound correspondences: Latin p corresponds to English f not just in 'pater/father' but also in 'piscis/fish,' 'pes/foot,' and many other pairs. A pattern repeated across large vocabulary cannot be coincidence — it must reflect a regular process of sound change from a shared ancestor. Systematicity, not surface similarity, is the evidence for common ancestry.
Question 2 Multiple Choice
English and Basque both look and sound very different from Persian. Based on historical linguistics methodology, which pair — English/Persian or English/Basque — is genetically related?
AEnglish and Basque — they are geographically closer and share some vocabulary through contact
BEnglish and Persian — both are Indo-European languages with systematic sound correspondences traceable to Proto-Indo-European
CNeither pair is related — modern languages diverge too much over time to establish historical relationships
DBoth pairs are equally related since all languages ultimately share a common ancestor
Historical linguistics determines relatedness through systematic sound correspondences and shared cognates, not surface similarity or geography. English and Persian are both Indo-European — they share systematic correspondences traceable to Proto-Indo-European, even though they look very different today. Basque is a language isolate with no known relatives; it shows no systematic correspondences with English. Surface similarity can actually mislead — Japanese and Chinese share many vocabulary items due to borrowing but are not genetically related.
Question 3 True / False
Proto-Indo-European is a discovered ancient language preserved in early texts, from which the modern Indo-European languages descend.
TTrue
FFalse
Answer: False
Proto-Indo-European was never written down and no direct records survive. It is a scientific reconstruction — a model of the ancestral language inferred from systematic comparisons across its descendants. The asterisk (*) placed before reconstructed forms (like *ph₂tḗr) signals this status. The reconstruction is not a guess but a hypothesis supported by multiple converging lines of evidence, subject to revision as new data emerge — analogous to how physicists infer unobserved particles from observable effects.
Question 4 True / False
Language change is a sign of deterioration — modern English is a degraded form of older, purer English.
TTrue
FFalse
Answer: False
No historical stage of a language is more 'correct,' 'pure,' or 'complete' than any other. Historical linguistics treats language change as a natural, regular process — not improvement or deterioration. Old English, Middle English, and Modern English are all equally valid systems adapted to their communicative contexts. The idea that older = purer conflates prescriptive attitudes about style with descriptive facts about language evolution.
Question 5 Short Answer
Why do linguists use systematic sound correspondences rather than vocabulary similarity to determine whether two languages are related, and what problem does this solve?
Think about your answer, then reveal below.
Model answer: Vocabulary similarity can result from borrowing — two unrelated languages in long contact may share thousands of words without sharing ancestry. Systematic sound correspondences cannot be borrowed: they reflect inherited patterns of regular change that two languages undergo separately after diverging from a common ancestor. If Latin p consistently corresponds to English f across a large cognate set, that regularity can only be explained by shared inheritance from a common ancestor, not by contact borrowing.
This distinction is crucial to the comparative method's validity. English has borrowed heavily from French, Latin, and Greek, creating vocabulary similarities with many languages. But the systematic correspondence sets that prove Indo-European relatedness — where the same correspondence holds across dozens of basic vocabulary items — cannot be the result of borrowing. Borrowed words typically follow the phonological patterns of the borrowing language, not the systematic transformations that mark true cognates.