题目内容：
教学片段：Teacher：Hell0，everyone，today we’re going to learn the Present Perfect．What is the Pres-ent Perfect?The Present Perfect is a grammatical combination of the present tense and the perfect as-pect，used to express a past event that has present consequences．For example：
I have already finished my homework．
She has worked out a plan．
As you can see．the Present Perfect is made up of two parts：have+past principle(done)…(Then the teacher began to illustrate different usages of the Present Perfect．)
(1)该教学片段采用什么方法呈现语法项目?(6分)
(2)你的判断依据是什么(至少2条)?(12分)
(3)分析该方法的利弊(至少各2条)，并举例说明。(8分)
(4)分析该教学片段所存在的问题。(4分)
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答案解析：