However,we can find many mistakes in the translation practice due to incorrect understanding or misunderstanding of the original text,including intralinguistic and interlinguistic misunderstanding or in correct understanding.

Lin Dajin refers to the appropriateness in speech acts as how well the speech content and the speech form of the users serve to adapt to the purpose of communication and the context,which should be viewed as the basic principle in speech acts .

Guided by the theory of "Error Analysis",this paper takes a high school s grade 3 students as research subjects,and tries to examine the effects of intralingual factors and personal factors on L2 learners simple past tense errors.