" is" , " am" , " are" makes this present, " is" , " am" , " are" .

所以：“是”、“是”、“是”使这个现在，“是”、“是”、“是”。

So, if our sentence is present progressive, we're going to use the present tense of the verb " to be" , " is am are" with a verb with " ing" .

所以，如果我们的句子是现在进行时，我们将使用动词“to be” 、“is am are” 的现在时和带有“ing” 的动词。

Present is: " is" , " am" , " are" , plus verb " ing" , but the past, we're going to use the past tense: " was" and " were" plus verb " ing" .

现在时是：“is” 、“am” 、“are” 加上动词“ing”，但过去时，我们要用过去时：“was” 和“were” 加上动词“ing” 。