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Learner mistake
Code-Switching Inappropriately
Shana Poplack (code-switching, 1980)
The short answer
Switching languages mid-sentence where it is not appropriate. In Taiwan, Singapore, Hong Kong and Malaysia code-switching is normal in casual talk, but it can read as unprofessional in formal settings.
Category
Pragmatics
How common
Common
Languages hit hardest
cantonese;chinese;malay;tagalog
What goes wrong
Switching between languages mid-sentence in a formal context where it's not appropriate.
The fix
Be mindful of the context and audience. Practice monolingual production in formal settings.
Example
Hong Kong Cantonese: 我聽日有個 meeting (ngo5 teng1 jat6 jau5 go3 meeting, 'I have a meeting tomorrow') is normal at the office; in a formal speech it sounds sloppy.
What it sounds like
Bilingual speakers
Kungfucius says: Code-switching is a skill. Switching because you forgot the word is a different skill.
When you feel like giving up
“If you feel like you’re losing everything, remember that trees lose their leaves every year, yet still stand tall and wait for better days to come.”
More mistakes to avoid
Strategy · CommonAvoidance of Complex StructuresSticking to simple sentences to avoid difficult structures, such as Chinese 把 bǎ sentences or Japanese relative clauses. It hides mistakes but freezes you at intermediate level.Pragmatics · CommonCode-Switching InappropriatelySwitching languages mid-sentence where it is not appropriate. In Taiwan, Singapore, Hong Kong and Malaysia code-switching is normal in casual talk, but it can read as unprofessional in formal settings.Grammar · CommonDifficulty with Classifiers/Measure WordsUsing the wrong measure word, or none, when counting nouns in Chinese, Japanese, Korean or Vietnamese. Mandarin alone has dozens in common use.Pronunciation · Very CommonDifficulty with PhonemesFailing to hear or produce sounds that do not exist in your native language. English speakers struggle with Mandarin zh/z/j and ü, Japanese long vowels, and the Korean three-way consonant contrast.Grammar · Very CommonDropping ArticlesLeaving out 'a' and 'the' when speaking English, common among speakers of Chinese, Japanese, Korean and Russian, whose languages have no articles. The reverse problem for English speakers is overusing 一個 (一个) yí ge in Chinese.Vocabulary · CommonFalse FriendsWords that look or sound familiar but mean something else. Between Chinese and Japanese, shared kanji words are a minefield, and Japanese katakana English is its own trap.Grammar · Very CommonGender and Number Confusion in PronounsUsing the wrong pronoun for gender (he/she) or number. Mandarin speakers often mix up he and she in English because spoken Mandarin uses one sound, tā, for both.Grammar · UncommonIgnoring Evidentiality MarkersFailing to mark how you know something (seen, heard, inferred) in languages where grammar expects it. Korean and Japanese use endings for hearsay and inference that English leaves to words like 'apparently'.Pragmatics · CommonIgnoring Pragmatic/Politeness LevelsSaying something grammatically correct but socially wrong, too blunt or too casual. Japanese keigo and Korean speech levels make this the signature intermediate mistake.Grammar · Very CommonIncorrect Preposition UsageUsing the wrong preposition because prepositions rarely map one-to-one between languages. Chinese uses coverbs (在 zài, 給 gěi, 跟 gēn) and Japanese uses postpositional particles (に ni, で de), which confuse English speakers.Pronunciation · Very CommonIncorrect Stress/RhythmPutting stress on the wrong syllable or using the wrong rhythm. English is stress-timed; Japanese is mora-timed and Mandarin syllable-timed with neutral tones, so English rhythm leaks in.Pronunciation · Very CommonIncorrect Tone UsageUsing the wrong pitch contour on a syllable in a tonal language, which changes the word itself, not just the mood. It is the classic first-year mistake in Mandarin, Cantonese and Vietnamese.Grammar · CommonIncorrect Use of Gerunds and InfinitivesUsing '-ing' where 'to' + verb is needed or vice versa ('I enjoy to swim'). An English-learner problem; the Japanese parallel is choosing between の no and こと koto to turn verbs into nouns.Grammar · CommonIncorrect Word Order in QuestionsForming questions with the wrong structure. English inverts and adds 'do'; Chinese keeps statement order and adds 嗎 (吗) ma or leaves the question word in place; Japanese adds か ka.Grammar · Very CommonL1 Sentence Structure TransferCopying your native word order into the target language. English speakers put the time, place and verb in the wrong slots in Chinese, and the verb anywhere but last in Japanese and Korean.Grammar · CommonLack of Noun/Adjective AgreementFailing to make adjectives agree in gender or number with nouns, a European-language problem. The Asian twist: Chinese, Japanese and Korean adjectives never agree, but Japanese has two adjective classes (i and na) that learners mix up.Vocabulary/Pragmatics · Very CommonLiteral Translation (Calque)Translating idioms word for word, so the result makes no sense in the target language. Some calques do succeed: 'long time no see' is thought to come from Chinese 好久不見.Grammar · CommonMisuse of ConjunctionsUsing 'and', 'but', 'so' incorrectly. In Chinese, the big trap is using 和 hé ('and') to join clauses, when it only joins nouns.Grammar · CommonMisuse of Modal VerbsConfusing words for possibility, ability, permission and obligation. Mandarin splits English 'can' into three: 會 (会) huì (learned skill), 能 néng (ability, circumstances) and 可以 kěyǐ (permission).Grammar · Very CommonOvergeneralization of RulesApplying a rule everywhere, including the exceptions, like 'goed' for 'went'. In Asian languages it shows up as one measure word for everything or one reading for every kanji.Pragmatics · Very CommonOveruse of Fillers from L1Using native-language fillers like 'um' or 'uh' while speaking a new language. Every language has its own: Japanese えーと (ēto) and あの (ano), Mandarin 那個 (那个) nèige and 就是 jiùshì, Korean 음 (eum) and 저기 (jeogi).Grammar · CommonSubject-Verb Agreement ErrorUsing a singular verb with a plural subject or vice versa ('the dogs runs'). Speakers of Chinese, Japanese, Korean and Vietnamese, whose verbs never change for person or number, find this English rule easy to forget.Pronunciation · CommonUnaspirated/Aspirated Consonant ConfusionNot distinguishing consonants that differ only by a puff of air. In Mandarin, b/p, d/t and g/k differ by aspiration, not voicing; Korean has a three-way contrast (ㄱ/ㅋ/ㄲ).Grammar · CommonWrong Conditional FormUsing the wrong structure for hypothetical situations. In Japanese the trap is choosing between four conditionals: と, ば, たら and なら.Grammar · Very CommonWrong Verb Tense/AspectUsing the wrong tense or aspect for an action. Chinese has no tense endings but uses aspect particles like 了 le and 過 (过) guo, which English speakers misuse as a 'past tense' marker.