1.We're all gonna remember the next 16 minutes for a long time after we leave East High.

gonna，是口语表达中常用的词，意思是“将要”，相当于going to；

例句：

Looks like I am gonna have to buy a winter suit, too.
看来我也得去买一套冬季西装。

Now I can not see anything because everyone is standing- I am gonna stand, too.
大家都站起来，所以我什么都看不到—我也要站起来。

2.Score! Gotta work together.

gotta

美国俚语，相当于have got to“必须”；

例句：

Gotta go. Check you later.

得走了。以后再打电话给你。

I gotta/I've gotta go.

我得走了。