shurui ga ooi.

subject particle

Breakdown of shurui ga ooi.

• 多おおい: many
• 種類しゅるい: a kind; species

Questions & Answers about shurui ga ooi.

How do you read 種類　が　多い。?

It is read:

しゅるい が おおい。

• 種類（しゅるい） = kind, type, variety
• が = subject marker
• 多い（おおい） = many / numerous

So the sentence is literally something like The kinds/types are many.

What does が do in this sentence?

が marks 種類 as the grammatical subject of 多い.

So in 種類が多い, the thing being described as many/numerous is 種類.

A very literal breakdown is:

• 種類 = types / varieties
• が = are / is the thing that...
• 多い = many

Natural English usually becomes something like:

• There are many kinds.
• It has many varieties.
• The selection is wide.

The exact translation depends on context.

Why is 多い used here? I thought many in Japanese was たくさん.

Both 多い and たくさん relate to large quantity, but they work differently.

• 多い is an i-adjective
• たくさん is usually an adverb or noun-like word

So:

• 種類が多い = There are many kinds / The variety is large
• 種類がたくさんある = There are a lot of kinds

Both are natural, but 種類が多い is a very common and compact way to say that something has a lot of variety.