A quiet notebook from Nako's Q&A

Nako separates the jobs: の turns 働く into an action that can be discussed, and が marks that action in relation to 大好き. The sentence naturally means “I love working here.”

Attach ながら to the ます-stem of the first verb, then place the main action after it. Nako's example 友達と話しながら歩く is “walk while talking with a friend.”

Nako shows that the situation and sentence shape decide the English gloss. もう大丈夫 looks at a changed state, もういいよ can mean “that's enough,” and もう食べましたか asks whether it has happened yet.

As one starting point, Nako contrasts a known topic with a newly identified or spotlighted subject. あの人はNakoです talks about that person; あの人がNakoです identifies which person is Nako. She is careful that this is only part of the full system.

Nako gives に an arrow-or-point image: a destination, exact time, or target. で marks where an action happens, or a tool and means: 学校に行く, 教室で勉強する, 電車で帰る.

Nako starts from its harsh or astringent sense, then explains the modern slang as an intense reaction, close to a stronger やばい. Context decides whether it praises something amazing or condemns something horrible.

Both are natural, but they tell different stories. は contrasts the past with a new direction from now on; も says the action has already been happening and will continue.

The い-adjective already becomes past in おいしかった. The following です adds politeness, not another past tense, so おいしかったでした and おいしいでした are both incorrect.