Yes, you can still use a set of silverware even if one piece is missing. While having a complete set is ideal, it is not essential for the functionality of the remaining pieces. As long as you have the necessary utensils for your meal, such as a fork, a knife, and a spoon, you can still use them without issue.
If a specific piece is missing, you can simply adjust by using alternative utensils or improvising with what you have available. For example, if a salad fork is missing, you can use a regular dinner fork instead. If a teaspoon is missing, you can use a dessert spoon or a smaller-sized tablespoon.
While it's nice to have a complete matching set for aesthetic purposes or formal occasions, the absence of one piece should not hinder your ability to enjoy a meal or use the remaining silverware effectively.