がいっぱい

a lot of

→ が
phrase Uncommon #12,107
a lot of Used after a noun to say there is a lot of it or that something is full of it. The particle が marks what there is a lot of.
JA: 冷蔵庫に野菜がいっぱいある。
EN: There are lots of vegetables in the fridge.

こっちで新しい友達がいっぱいできたんだ。

I've made lots of new friends here.

軍隊がいっぱい来てるから

Because a lot of troops are coming.

— ハウルの動く城 (2004)

これを食べたらおならがいっぱい出るよ。

If you eat this, you'll fart a lot.

軍隊がいっぱい来てる。

A lot of soldiers are coming.

する事がいっぱいあります。

I have a lot of things to do.

その夜、空には雲がいっぱい出ていた。

That night, the sky was full of clouds.