信号词：(建议考生，每天要把所有的信号词读个几遍，强迫自己听到这个词马上反应过来这里有考点。)
Today, we'll focus on/constrated/discuss…
Today, our topic is…
Let's…
特殊情况(也经常出现)：开头会将讲一些上次课讲的东西，作为复习，之后才是主旨，我们把这种情况称为：Miss start
注意：出现Miss Start，上次课讲的东西一定要听，在这部分很可能出细节题。
Miss Start 信号词：Before we get started, let's review what we've learned last class…
Let's pick up where we left off last week, OK, as you recall(记得)…
Before we begin our discussion on…(此处为本次主题)，Let's review what we know about…(此处为上次主题)
间接开头： In your text book, the author says that… (主题出现)，I thought we all to/should take sometime to talk about it. (不一定完全一样，但是类型差不多。)
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