ed是past tense,在句子里有提到过去的就要在动词上放
例子:I jog in the park yesterday
yesterday是过去,因此我们要把句子改成:
I jogged in the park yesterday
而ing分为两种,叫做present continuous tense和past continuous tense
这两个都差不多,只是一个是past,一个是present
例子1=I am jogging in the park
例子2=I was jogging in the park yesterday morning
就这样,希望可以帮到你