Imperative sentences in Estonian grammar are used to give commands, requests, or instructions. In Estonian, the imperative mood is formed by using the stem of the verb, with or without an ending, depending on the person and number. The endings can be omitted for the 2nd person singular and plural, while the 3rd person requires an ending. The imperative mood in Estonian is versatile and widely used in daily communication. It’s important for language learners to practice and master the formation and usage of imperative sentences in Estonian.