我是意译.因为感觉是阅读理解里面的句子
1.If the primary goal of language use is communication,then mistakes are secondary considerations that may be daelt with gradually as awarenessof those mistakes increases.
如果语言的首要目的是沟通的话,那么学习过程中所犯的错误由于可以随着我们理解的加深而得到纠正,因而便显得没那么重要了
（条件状语从句）
2.The resulting discrepancy can serve as a base for the student to modify his way of using the present tense in english.
差异可以作为一个基础（没有上下文,不知道怎么翻）,来使学生在他所用的现在时中进行修改.
（就是一般的主+动词+表语的结构）
3.But a student who is unwilling to interact in the first place would lose this opportunity to learn by trial and error.
但是如果学生不愿意互相交流,那么他将会失去在不断尝试中成长的机会
who引导定从修饰学生,什么样的学生,
trial and error是固定搭配=反复试验,不断尝试,