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plCommon errors
Syntactic errors
Learners might add question particle 吗/嗎 at the end of the question, when questions formed with 哪 should not end with 吗/嗎.
*你要买哪一个吗？
你要买哪一个？
*你要買哪一個嗎？
你要買哪一個？
Learners might forget to add a measure word, when it is obligatory.
*你要哪书？
你要哪本书？
*你要哪書？
你要哪本書？
Lexical errors
Learners might confuse pronoun 哪 and 那 as they are similar in both graphic and phonetic form.
你要买那一个？
你要買那一個？
Do you want to buy this one?
(Question marked by intonation)
你要买哪一个？
你要買哪一個？
Which one do you want to buy?
Learners might confuse phrase 哪些 with 几个/幾個 when trying to ask ‘how many’.
*你有哪些哥哥？
你有几个哥哥？
*你有哪些哥哥？
你有幾個哥哥？