問題是

wenˋ tiˊ shiˋ

(Issue, Question, problem is) The question is | The problem is | The issue is

問題 wenˋ tiˊ

(Concern, Concerns, Problem, Problems, Question, Questions) Question, Problem, Problems, A problem, The problem, The problems, Questions, A question, The question, The questions, Concern, Concerns, A concern, The concern, The concerns

是 shiˋ

Is, To be, Am/Are/Is/Was/Were, Being, Yes

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