We use the present continuous to talk about fixed future arrangements.
现在进行时用于表示安排好的将来动作。
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。
We use the present continuous to talk about present situations which we see as short-term or temporary.
我们使用现在的连续谈论我们视为的现在的情形短期或暂时的。
T summarizes:We use the present continuous tense to talk about things that are happening now or these days.
现在进行时表示现在（说话瞬间）或现阶段正在进行或发生的动作。
The glittering descriptions and use of the present continuous tense add to the immediacy.
华丽的描述和现在进行时的使用增添了实感。
You'll notice that's its very common for a native speaker to use the present perfect continuous like this when greeting a buddy.
你会发现对于一个母语使用者，他们在问候兄弟时很喜欢用现在完成进行时。
At present, several formulas of impact load about debris flow in common use are based on the hypothesis that debris flow is continuous flow.
目前针对泥石流冲击压力的计算公式均假定泥石流体为连续流体。
When talking about current employment be careful to use the present perfect or present perfect continuous.
谈起目前的就业要小心使用现在时。
The investigation of sampled-data systems is motivated primarily due to the widespread use of digitally implemented controller in present-day feedback control of continuous time systems.
当今连续受控系统中数字控制器的广泛运用促进了对采样数据控制系统的研究。
The following sections present an in-depth description of the concepts behind continuous physics. It is not necessary to understand this part in order to use the engine at a basic level.
下面的章节会深度描述连续物理背后的知识，简单使用的话没有必要理解这一部分。
We use the present perfect continuous (I have been doing) for situations over a short time. We use the present perfect (I have done) for situations that exist for a longer time.
现在完成进行时用在短时间的情况，现在完成时用于长时间的情况。
Question 49: What is the right use of the present continuous tense?
问题49：如何正确使用现在进行时？
Question 49: What is the right use of the present continuous tense?
问题49：如何正确使用现在进行时？
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