Final answer:
Sentence 1 ('kicked the bucket') and Sentence 3 ('feeling under the weather') as well as Sentence 4 ('raining cats and dogs') are examples of idioms. Sentence 2 ('passed away') is an example of a euphemism.
Step-by-step explanation:
To determine which sentences include idioms and which include euphemisms, we should first define both terms. An idiom is a phrase where the meaning cannot be deduced from the literal definitions of the words that make it up, and a euphemism is a polite or mild word or expression used to refer to something embarrassing, taboo, or unpleasant.
- Sentence 1: She kicked the bucket. (Idiom)
- Sentence 2: He passed away. (Euphemism)
- Sentence 3: I'm feeling under the weather. (Idiom)
- Sentence 4: It's raining cats and dogs. (Idiom)