【技能讲解】 1.同位语是对句子中的某一成分作进一步的解释、说明,可以作同位语的有名词、代词、数词、介词短语、不定式、动名词和从句等。2.插入语的恰当使用,会彰显写作的功底,是文章得分的一个亮点。常用的有:to tell you the truth, to begin with, to make things worse, generally/frankly speaking, judging from, to one's surprise/joy, more importantly, worse still, believe it or not, last but not least, by the way等。