下面是一段初中英语课堂实录片段。阅读后回答下列四个问题：
教学片段：
Teacher: Hello, everyone, today we"re going to learn the Present Perfect. What is the Present Perfect The Present Perfect is a grammatical combination of the present tense and the perfect aspect, 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.) 分析该教学片段所存在的问题。