Breakdown of asa wa chuurinjou ga ippai nanode, jitensha de wa naku basu de gakkou ni ikimasu.
Questions & Answers about asa wa chuurinjou ga ippai nanode, jitensha de wa naku basu de gakkou ni ikimasu.
Because 駐輪場 is the thing being described by いっぱい.
In this sentence, いっぱい means full, so 駐輪場がいっぱい means:
- the bike parking area is full
A very common pattern is:
- A が いっぱい = A is full
So が marks the subject of that description.
