present perfect的例句大全

The present perfect tense emphasizes the effect of the past action on the present.

现在完成式强调过去所发生的事情对现在的影响.

To grasp the usage of the present perfect tense.

掌握现在完成时态的用法.

Past simple or present perfect?

一般过去时还是现在完成时?

The tense is present perfect progressive.

进行时)(现在,过去,将来,现在完成-进行时 )

Sum up the new vocabulary in this Unit, and Present Perfect Tense.

明确本单元所学的词汇和语法,增强他们正确操作的能力.

Explaining some topic already obtained uses present perfect tense.

说明某个课题现在已经取得的成果,适宜采用现在完成时.

Explain and illustrate the main use of the present perfect tense.

解释并举例说明现在完成时态的用法.

Rewrite the following sentences using the Present Perfect Passive Voice.

用现在完成时的被动语态改写下列句子.

There is no exactly equivalent French tense to the present perfect tense in English.

法语里没有和英语中的现在完成时完全对应的时态.

Youll notice thats 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。

The present and past perfect tenses both belong to the perfect tense.

现在完成时和过去完成时都属于完成时态.

Chi-square test results reveal that all the three linguistic factors exert significant effects on the use of the present perfect.

结果发现，这三种语言因素对现在完成时的使用都有显著影响。突显度不同的规则动词和不规则动词在现在完成时的正确使用中表现出较大的差别。

At present, piezoelectric ceramic actuator is relatively perfect driving element in micro-displacement technology. Its appearance inaugurates new times of precision of nanometer.

压电陶瓷致动器是目前微位移技术中比较理想的驱动元件，它的出现开创了精度进入纳米级的新时代。

Aiming to minimize the torque ripple in condition of non-perfect BEMF waveform, the dissertation present a optimum current tracking control technique.

实际中一般是这两种情况都存在。针对这种反电动势波形偏离理想波形的情况，本文提出了一种最优电流跟踪法来抑制转矩脉动。

However, many problems about ECAP are not clear and the fabricating not perfect at present.

但是, 到目前为止,对等径角挤压技术,尚有许多问题不清楚,在制备技术上仍存在一些问题.

At present, Our country network marriage website also is in ceaseless emerge in large numbers and perfect, Such as love "Residence"," virtual city"," ninth city".

目前，我国有关网络婚姻的网站也在不断的涌现和完善，如爱情公寓、虚拟城市第九城市等。

Finally, the legislative state of corruption offence of our country at present, put forward the corresponding measure with perfect legislation.

最后，就目前我国贪污罪立法状况，提出相应的立法完善的措施。

RSA crypto-algorithm is as the most mature and perfect in all asymmetrical key system at present.

RSA密码算法是目前公认的,在理论和实际应用中最为成熟和完善的一种非对称密钥体制.

A Semantic Study of the English Simple Past Tense and the Present Perfect

实话英语的时态一般过去时和现在完成体的语义研究

They were all concerning about the past tense and the present perfect.

那些练习题都是跟一般过去时和现在完成时有关的。