什么情况下用be动词的过去式？

英语小辈：
一般过去时：用动词过去式
如go,work,study...
I went to school .
I worked in the daytime.
She studied English carefully.
这些动词都是行为动词（或叫实意动词），具有实际意义的动词。这类动词直接用过去式构成一般过去时。
如果动词是联系动词be时，表“是”，那就用be的过去式was,were.

我们（是)快乐的。-We were happy.
我是男生。-I was a boy.

I went to the park是一般过去啊
换成一般现在是就是I go to the park
被动词也是动词，当然有过去式
is--was
are--were

原形 过去式
abide abode,
abided abode,
alight alighted,
arise arose
awake awoke
be was, were been
bear bore borne, born
beat beat beaten
become became become
befall befell befallen
beget begot begotten, begot
begin began begun
behold beheld beheld
bend bent bent
bereave bereaved, bereft bereaved, bereft
beseech besought, beseeched besought, beseeched
beset beset beset
bespeak bespoke bespoken, bespoke
bespread bespread bespread
bestr