Sentence examples for they would do from inspiring English sources

"they would do" is a correct and usable phrase in written English.
It is often used to talk about hypothetical or imagined scenarios, as in the following example: "If they won the lottery, they would do all sorts of extravagant things, like travel the world and buy a mansion." In this sentence, the phrase "they would do" indicates that the actions mentioned are not currently happening, but could potentially happen in the future if a certain condition (winning the lottery) is met. Overall, "they would do" is a useful phrase to express potential or imagined actions, and can be used in a variety of contexts.