一般现在时

2 A clear glass capillary tube is fixed vertically in a beaker.

例2的问题是时态不统一，一般现在时和一般过去时交替使用，给读者的感觉好象是这个实验是在过去和现在两个时空中完成的，这是不可思议的。

It took Mr Wang half an hour to clean the bedroom.

可以用于一般现在时，一般过去式和一般将来时态。

T: In if clause we can use the Simple Present Tense, and we can use theFuture Tense in main clause.

条件状语从S1： if 条件状语从句要用一般现在时表示将来，而主句要用一般将来时。

Neuroleptic Malignant Syndrome can be induced by the use of either one kind of high-potency neuroleptic or many kinds of drugs at one time.

2.1.3 当描述的对象是一般事实或客观存在，无论是过去、现在或将来都是如此时，也用一般现在时这类现象常出现在定语从句中。

Also, we practiced putting together sentence structures using simple present, simple past, and present progressive tenses.

同样的，我们还练习了把一般现在时，一般过去时和现在进行时一些句子结构结合在一起。

We use the simple present to talk about things in general.

当谈论事情的一般状态的时，我们使用一般现在时。

I don't have luch at home. They don't play basketball on the sportsground. Mr.Jimmy doesn't know French.

一般现在时一般现在时-表示将来在一些情况下，一般将来时能用来表示将来时。

If I should see him this afternoon, I would give the note to him.If there were to be a meeting this evening, I would come.If it tomorrow, we put off the visit to the Yangpu Bridge.('94上海)A. rains; would have had to B. were to rain; will have toC. should rain; would have to D.

析：选C。根据语境中所给时间状语tomorrow可知，这是表示将来的条件状语从句，本句可使用陈述语气(条件句用一般现在时，主句用一般将来时)，也可使用与将来事实相反的虚拟语气条件句用did/were to do/should do。。。，主句用would do。。。

Had been doing have/has been doing 一般进行完成过去 was/were given was/were being given had been given 现在 am/is/are given am/is/are being given have/has been given /将来 will/shall be given / will/shall have been given /过去将来 should/would be given / should/would have been given

完成进行 2。被动形式/ CET-4 常考的三种时态：过去完成时；将来完成时；完成进行时。时间状语从句当中的时态：一般过去时所有的过去用一般现在时表示现在和将来现在完成时现在完成和将来完成一。非谓语动词一。

Had been doing have/has been doing /一般进行完成过去 was/were given was/were given had been given being 现在 am/is/are given am/is/are being given have/has been given 将来 will/shall be given / will/shall have been given /过去将来 should/would given / should/would have been given be

完成进行 2。被动形式// CET-4 常考的三种时态：过去完成时；将来完成时；完成进行时。时间状语从句当中的时态：一般过去时所有的过去用一般现在时表示现在和将来现在完成时现在完成和将来完成一。非谓语动词一。

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。