At this point your child may have graduated from using just “more” to get more of an item. You are going to see more novel word combinations such as “I want that too” or “I want another one”. The best way to encourage these phrases is by verbally modeling them yourself and creating opportunities for your children to use them.
To create these opportunities, only give your children a little bit of each item. For instance, if their eating Cheerios just give them 5 since they are obviously going to want more. You can then show it to them in your hand to motivate a phrase that requires recurrence (or a fancy word for more!).
There are many times throughout the day you can do this such as mealtime, snack time, play time (e.g. – withholding blocks), story time (e.g. – do not turn the page and have them ask for more of the book), bath time, etc. We love finding fun, new ways to extend phrases!