sono kouen wa yuugu ga ooi node, kodomotachi wa nagai jikan asobemasu.

That park has a lot of playground equipment, so children can play for a long time.

Breakdown of sono kouen wa yuugu ga ooi node, kodomotachi wa nagai jikan asobemasu.

• は: topic particle
• 子こ供ども: child
• が: subject particle
• 公園こうえん: park

Questions & Answers about sono kouen wa yuugu ga ooi node, kodomotachi wa nagai jikan asobemasu.

Why is it 公園は but 遊具が?

This is a very common pattern in Japanese.

• 公園は sets the overall topic: As for that park...
• 遊具が多い says what is true about that park: it has many playground structures/equipment

So the sentence is structured like:

• その公園は = speaking about that park
• 遊具が多い = the playground equipment is numerous

In other words, は marks the big topic, while が marks the thing being described within that topic.

A very literal breakdown would be:

• As for that park, playground equipment is plentiful, so...

This kind of は ... が ... pattern is extremely common in Japanese.

Why is 多い used here instead of a verb meaning to have?

Japanese often expresses having a lot of something with the pattern:

• Noun が 多い = there is a lot of N / N is numerous

So:

• 遊具が多い = there is a lot of playground equipment

Japanese does have verbs like ある and いる for existence, but 多い is the natural way to say that something exists in large quantity.

Compare:

• 遊具がある = there is playground equipment
• 遊具が多い = there is a lot of playground equipment

So 多い is not exactly have; it is more like be many / be numerous.

What exactly does 遊具 mean?