kono shigoto wa kurou ga ooi.

topic particle

Breakdown of kono shigoto wa kurou ga ooi.

• が: subject particle
• この: this
• 多おおい: many

Questions & Answers about kono shigoto wa kurou ga ooi.

Why are there both は and が in the same sentence?

This is very common in Japanese.

• この仕事は sets the topic: as for this job ...
• 苦労が多い says something about that topic: there are many hardships / it involves a lot of hardship

So the structure is roughly:

[Topic] は [subject inside the comment] が + description

In other words, この仕事 is the overall thing being talked about, while 苦労 is the thing that is specifically described as being 多い.

A natural breakdown is:

• この仕事は = as for this job
• 苦労が多い = the hardships are many

This kind of double marking is normal in Japanese.

Why is it 苦労が多い and not 苦労は多い?

Because 苦労 is the thing being described by 多い.

With が, the sentence simply states that, within the topic of this job, hardship is plentiful.

If you said 苦労は多い, it would sound more contrastive, like:

• Hardship is plentiful, but ...
• As for hardship, there is a lot of it

So が is the more neutral choice here.

Very roughly:

• 苦労が多い = there is a lot of hardship
• 苦労は多い = hardship, at least, is a lot / there’s a lot of hardship (in contrast to something else)