watashi wa kono shigoto ni sekinin o motte imasu.

I take responsibility for this work.

Breakdown of watashi wa kono shigoto ni sekinin o motte imasu.

• は: topic particle
• 私わたし: I
• を: direct object particle
• 仕事しごと: work

Questions & Answers about watashi wa kono shigoto ni sekinin o motte imasu.

Why is は used after 私?

は marks 私 as the topic of the sentence. It sets up as for me...

So:

• 私は = as for me / I
• 私が would sound different; it would emphasize I as the person responsible, often in contrast to someone else.

In this sentence, は is the most natural choice if you are simply stating your responsibility.

Why is there a に after 仕事?

In 仕事に責任を持つ, the particle に marks the thing that the responsibility is directed toward.

So:

• この仕事に = for this job / regarding this work
• 責任を持つ = to have/take responsibility

This is just the normal pattern for this expression:

• A に 責任を持つ = to be responsible for A

Even though English uses for, Japanese uses に here.

Why is it 責任を持つ and not 責任がある?