Revising the present / future / past indefinite tense and the present continuous tense 复习一般现在/将来/过去时和现在进行时。
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We use the present continuous tense to talk about things that are happening now 我们使用现在进行时谈论现在正在发生的事情
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Present continuous tense 现在进行时
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Reason : the vocabulary of trees and environment and the relative background knowledge is widely used . the present continuous tense is one of the most important tenses in english language 难点:用采访中列举的大量事实来回答有关树木的问题,能够在日常生活中得到有效的理解和运用。