An Indefinite pronoun does not refer to any specific person, thing or amount. Mostly, indefinite pronouns are singular or plural while some of them, however, can be singular and plural.
Something: an object that unspecified, not known or stated.
Nothing: not any object.
Something
Positive clause + something
Nothing
Nothing + verb + complementary
- Right now, nothing is in good state.
- There is nothing clean in the house.
- I need something like a microwave.
- Something smells terrible in the gas oven.
Something means a thing that is unspecified. It is used in positive sentences.
Nothing means no single object. We use nothing like a subject of a sentence or question. We cannot use nothing with negative sentences because nothing has already a negative meaning.