In his famous book Learned Optimism, Martin Seligman points out how our present use of language can be a fairly accurate predictor of future success.

马丁·赛里格曼在他那本著名的《习得的乐观》中指出，我们目前使用语言的方式可以相当准确地预测未来能否成功。

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Use this pattern whenever you want to find out about the timing of an event in the past, present, or future.

当你想知道过去、现在或者未来某件事发生的时间时，你都可以使用这个句型。

When 课堂 - SpeakingMax英语口语达人

You could use PCR to do that because if you amplify a gene in PCR, that gene had to be present from the beginning.

你可以用PCR技术来鉴定,因为如果你能用PCR扩增某一段基因,说明它从一开始就肯定是存在的

耶鲁公开课 - 生物医学工程探索课程节选

You can also use PCR to identify specific genes that are present in a biological sample.

你也可以利用PCR技术去识别,一个生物样本中的某段特定基因

耶鲁公开课 - 生物医学工程探索课程节选

According to the Centers for Disease Control and Prevention, the estimated rate of U.S. high schoolers admitting past or present use of steroids has grown from 1 in 45 in 1993 to 1 in 16 in 2005, and there are no indications the rate is not continuing to increase.

FORBES: 32 Indicted in Steroid Ring That Targeted High School Athletes

All languages, both past and present, use technical terms inaccessible to the ordinary speaker.

FORBES: American Political Economy Alters English Language

At present, lorries use the city as a short cut from junction 18 of the M4 - along London Road and Cleveland Bridge - en route to the south coast.

BBC: Bath loses fight to ban lorries from Cleveland Bridge