You need to have the perfect form.

必须要用完成式。

Please make a sentence using the present perfect tense.

请以现在完成式的时态造句。

Present perfect is about an experience which happened from a time in the past until now.

现在完成式是关于从过去到现在的经历。

Americans also tend to use the simple past tense while Britons use the present perfect.

不过美国人依倾向于用一般过去式，而英国人依会用现在完成式。

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。

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

当我上的时候，我通常会先上几节关于过去完成式的，再继续学习。

At a certain age, we've aII had reIationships...

我们各自拥有 不太完美的过去完成式。

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。

British English speakers would generally use the present perfect in this situation, as in " I've lost my phone… again" .

在这种情况下，说英式英语的人一般会用现在完成式" I’ve lost my phone… again" 。

You can even write present progressive or present perfect progressive in our comments.

您甚至可以在我们的评论中写下现在进行式或现在完成进行式。

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。

So, this could also be called present perfect progressive. And this one can also be called past perfect progressive.

所以，这也可以称为现在完成进行时。而这个也可以称为过去完成时进行式。

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都是现在完成的进行式句子，它们有很多共同点。

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， 过去完成式的个人程，好吗？