American and British English speakers use the present perfect verb tense in similar ways.

英式英语和美式英语在现在完成式的使用上是比较相似的。

Now we have a filtration type of lab that you can do literally at home.

而现在，我们有了一种可以在家里完成的过滤式检测方法。

Please make a sentence using the present perfect tense.

请以现在完成式的时态造句。

So is the world made for introverts or extroverts?

今天的 usage tip 是介绍 it 加 has been 加过去词 加 that 的句型 它用於间接引述 以许主词 it 作为开头 搭配现在完成式的被动语态 表达一直以来有 that 句所述的主张 常用於本句型的动词 大多具有声称或是揭露的含义 除了 argue 以外呢 此句型也可以使用 claimreveal， report 等字词使用被动语态可淡化消息来源并将重点放在所主张的内容上来看例句It has been revealed that several celebrities were involved in the scandal据透露有多位名人卷入这起丑闻？

When I have a class, I'll usually do a few lessons on past perfect before moving on.

当我上课的时候，我通常会先上几节关于过去完成式的课，然后再继续学习。

So, if you feel that you need some more practice, by all means, watch that individual class on the past simple, on the past perfect, okay?

所以，如果你觉得你需要更多的练习， 一定要看那个简单的过去式， 过去完成式的个人课程，好吗？

Well, first of all you probably realize these are all present perfect progressive sentences, and they have a lot of things in common.

好吧， 首先你可能意识到这些是现在完成的进行式句，它们有很多共同点。

So we should be able to get to a South Korea-type prioritized testing thing within a few weeks.

所以我们应该能够在几周内完成韩国式的优先测试。