现在进行时
The Present Continuous Tense
NOW
Subject
be
verb-ing
+
+
(am, is, are)
Subject + be +
not
+ verb-ing
Be
+ Subject + verb-ing
?
Summary 总结
表示现在正在发生的动作 (Action NOW)
基本结构: 主语 + be (am, is, are) + v-ing
标志词: now, look, listen...
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