Hi 裕安, Yes, your grammar is fine. In your sentence , you used two participial adjectives: nauseated and disgusting. Participial adjectives that describe feelings often end with -ed or -ing forms and do take note that there is a difference. Let's take a look at this sentence: Tim is a very interesting speaker and I was very interested in what he has to say. As you can see, both "interesting" and "interested" are participial adjectives, with "interesting" describing Tim's ability while "interested" describes my attitude towards him. They are related because someone who is "interesting" (a ability or quality) CAUSES someone else to be "interested" (a state of mind). Yet, they are different because they have different meanings. In your sentence, "nauseated" describes your feeling after something CAUSED you to feel that way. "disgusting" describes something (the smelly vomit) that provides that CAUSE of your feeling. Something "nauseating" makes you feel "nauseated". Something "interesting" makes you feel "interested". A few more examples: I am so bored (State of mind) after watching a boring (something that causes you to feel bored) show. There will be an exciting plan (something that causes the kids to feel excited) and I am sure the kids will be excited. (state of mind)

yes, correct

Maybe， when smelling...