To construct useful phrases and sentences in English using "some," you can use it to indicate a quantity that is not specific but more than none. For example, "I have some friends coming over for dinner." You can also use it to imply a certain amount of something, such as "There are some cookies left in the jar." Additionally, you can use "some" to suggest a vague or indefinite quality, like "He has some interesting ideas." Overall, using "some" in English allows for flexibility and ambiguity in expressing quantities and qualities in your sentences.