This essay is a research report,which is based on results of grammatical error analysis and interviews with linguistic teachers.These researches are conducted in four language streams,namely,Chinese,Spanish,Korean and Japanese.It will talk about problems identiffed in all these four language streams,with Chinese as the focus.Although according to various definitions,translation competence includes several parts,which are all required for a professional translator; this essay covers mainly the linguistic competence with tense and aspect issue as the main point.Meanwhile,some major causes of mistakes will be identified,such as interference of mother tongue,lack of second language proficiency.In the end,some possible ways for improvement are presented for reaching what are needed for a professional translator.