Classification and related languages

The English language belongs to the Anglo-Frisian sub-group of the West Germanic branch of the Germanic family, a member of the Indo-European languages. Modern English is the direct descendant of Middle English, itself a direct descendant of Old English, a descendant of Proto-Germanic. Typical of most Germanic languages, English is characterised by the use of modal verbs, the division of verbs into strong and weak classes, and common sound shifts from Proto-Indo-European known as Grimm's Law. The closest living relatives of English are the Scots language (spoken primarily in Scotland and parts of Ireland) and Frisian (spoken on the southern fringes of the North Sea in Denmark, the Netherlands, and Germany).

After Scots and Frisian come those Germanic languages that are more distantly related: the non-Anglo-Frisian West Germanic languages (Dutch, Afrikaans, Low German, High German), and the North Germanic languages (Swedish, Danish, Norwegian, Icelandic, and Faroese). With the exception of Scots, none of the other languages is mutually intelligible with English, owing in part to the divergences in lexis, syntax, semantics, and phonology, and to the isolation afforded to the English language by the British Isles, although some, such as Dutch, do show strong affinities with English, especially to earlier stages of the language. Isolation has allowed English and Scots (as well as Icelandic and Faroese) to develop independently of the Continental Germanic languages and their influences over time.

In addition to isolation, lexical differences between English and other Germanic languages exist due to heavy borrowing in English of words from Latin and French. For example, we say "exit" (Latin), vs. Dutch uitgang, literally "out-going" (though outgang survives dialectally in restricted usage) and "change" (French) vs. German Änderung (literally "alteration, othering"); "movement" (French) vs. German Bewegung ("be-way-ing", i.e. "proceeding along the way"); etc. Preference of one synonym over another also causes differentiation in lexis, even where both words are Germanic, as in English care vs. German Sorge. Both words descend from Proto-Germanic *karō and *surgō respectively, but *karō has become the dominant word in English for "care" while in German, Dutch, and Scandinavian languages, the *surgō root prevailed. *Surgō still survives in English, however, as sorrow.

In English, all basic grammatical particles added to nouns, verbs, adjectives, and adverbs are Germanic. For nouns, these include the normal plural marker -s/-es, and the possessive markers -'s and -s' . For verbs, these include the third person present ending -s/-es (e.g. he stands/he reaches ), the present participle ending -ing, the simple past tense and past participle ending -ed, and the formation of the English infinitive using to (e.g. "to drive"; cf. Old English tō drīfenne). Adverbs generally receive an -ly ending, and adjectives and adverbs are inflected for the comparative and superlative using -er and -est (e.g. fast/faster/fastest), or through a combination with more and most. These particles append freely to all English words regardless of origin (tsunamis; communicates; to buccaneer; during; bizarrely) and all derive from Old English. Even the lack or absence of affixes, known as zero or null (-Ø) affixes, derive from endings which previously existed in Old English (usually -e, -a, -u, -o, -an, etc.), that later weakened to -e, and have since ceased to be pronounced and spelt (e.g. Modern English "I sing" = I sing-Ø < I singe < Old English ic singe; "we thought" = we thought-Ø < we thoughte(n) < Old English wē þōhton).

Although the syntax of English is somewhat different from that of other West Germanic languages with regards to the placement and order of verbs (for example, "I have never seenanything in the square" = German Ich habe nie etwas auf dem Platz gesehen, and the Dutch Ik heb nooit iets op het plein gezien, where the participle is placed at the end), English syntax continues to adhere closely to that of the North Germanic languages, which are believed to have influenced English syntax during the Middle English Period (e.g., Danish Jeg haraldrig set noget på torvet; Icelandic Ég hef aldrei séð neitt á torginu). As in most Germanic languages, English adjectives usually come before the noun they modify, even when the adjective is of Latinate origin (e.g. medical emergency, national treasure). Also, English continues to make extensive use of self-explaining compounds (e.g. streetcar, classroom), and nouns which serve as modifiers (e.g. lamp post, life insurance company), a trait inherited from Old English (See also Kenning).

The kinship with other Germanic languages can also be seen in the large amount of cognates (e.g. Dutch zenden, German senden, English send; Dutch goud, German Gold, Englishgold, etc.). It also gives rise to false friends, see for example English time vs Norwegian time ("hour"), and differences in phonology can obscure words that really are related (tooth vs. German Zahn; compare also Danish tand). Sometimes both semantics and phonology are different (German Zeit ("time") is related to English "tide", but the English word, through a transitional phase of meaning "period"/"interval", has come primarily to mean gravitational effects on the ocean by the moon, though the original meaning is preserved in forms like tidingsand betide, and phrases such as to tide over).

Many North Germanic words entered English due to the settlement of Viking raiders and Danish invasions which began around the 9th century (see Danelaw). Many of these words are common words, often mistaken for being native, which shows how close-knit the relations between the English and the Scandinavian settlers were (See below: Old Norse origins). Dutch and Low German also had a considerable influence on English vocabulary, contributing common everyday terms and many nautical and trading terms (See below: Dutch and Low German origins).

Finally, English has been forming compound words and affixing existing words separately from the other Germanic languages for over 1500 years and has different habits in that regard. For instance, abstract nouns in English may be formed from native words by the suffixes "‑hood", "-ship", "-dom" and "-ness". All of these have cognate suffixes in most or all other Germanic languages, but their usage patterns have diverged, as German "Freiheit" vs. English "freedom" (the suffix "-heit" being cognate of English "-hood", while English "-dom" is cognate with German "-tum"). The Germanic languages Icelandic and Faroese also follow English in this respect, since, like English, they developed independent of German influences.

Many French words are also intelligible to an English speaker, especially when they are seen in writing (as pronunciations are often quite different), because English absorbed a large vocabulary from Norman and French, via Anglo-Norman after the Norman Conquest, and directly from French in subsequent centuries. As a result, a large portion of English vocabulary is derived from French, with some minor spelling differences (e.g. inflectional endings, use of old French spellings, lack of diacritics, etc.), as well as occasional divergences in meaning of so-called false friends: for example, compare "library" with the French librairie, which means bookstore; in French, the word for "library" is bibliothèque. The pronunciation of most French loanwords in English (with the exception of a handful of more recently borrowed words such as mirage, genre, café; or phrases like coup d’état, rendez-vous, etc.) has become largely anglicised and follows a typically English phonology and pattern of stress (compare English "nature" vs. French nature, "button" vs. bouton, "table" vs. table, "hour" vs. heure, "reside" vs.résider, etc.).