现在时

Firstly,It turms off automatically when operate（用什么时态更确切呢?operating? over one hour.

用现在时，但是operate在这里属于中式英语，用&运行&这个比较好一点。

2And the form of a subject should agree with that of the verb in therms of number in thepresent tense.

在现在时中主语的形式应该和动词的形式在数上保持一致。

Request is, must use when the general present and passive voice Through to Modbus the RTU model agreement and the wireless data acquisition system principle of work analysis, has designed based on the nRF2401 wireless data acquisition system automatic voice prompt pitch point.

要求是，要用一般现在时和被动语态）通过对Modbus RTU模式协议和无线数据采集系统工作原理的分析，设计了一个基于nRF2401的无线数据采集系统自动语音提示节点。

For example, I like music The word like tends to be used in simple present tense.

例如，我喜欢音乐。单词like趋向于用在一般现在时。

V2. When the swallows have gone, there is still time to return; when the poplar and willow trees have become withered, there is still time to see green; when the peach flowers have already faded, there is still time to blossom.

一般现在时表示恒常的事实(时间的匆匆流逝是不以人的意志为转移的，是浑然一体的，并暗示了读者要珍惜宝贵的时间)三个独立的句子结构上不够紧凑，层次感不强

Now watch me, I switch on the current and stand back.

第二句中的now是进行时的标志，表示正在进行的动作的客观状况，所以后句用一般现在时。

Now watch me, I switch on the current and stand back.

表示正在进行的动作的客观状况，所以后句用一般现在时。

Now watch me, I switch on the current and stand back.

第一句用一般现在时，用于操作演示或指导说明的示范性动作，表示言行的瞬间动作。

Scientists say that seventy-four different kinds of living things go extinct every day.

科学家说，每天有74种不同种类的生物灭绝。（主、从句都用了一般现在时。

Isn't it simply b/c to use present tense instead of future tense in a subordinate clause?

是不是所有的从句中都用一般现在时来表达一般将来时呢？

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。