Sentence examples for could do so from inspiring English sources

The phrase "could do so" is correct and usable in written English.
It is often used as a more formal or polite way of saying "could do that" or "could do it." It can be used in a variety of contexts, such as giving an instruction or suggestion, making a promise, or expressing a possibility or potential action. Example sentence: "I have some extra time this evening, so I could do the dishes for you if you'd like."