Here's a breakdown:
* Lexical verb: This is the main verb that carries the meaning of the sentence.
* Present progressive: This tense describes an action that is happening right now.
* Base form: This is the simplest form of the verb, without any endings.
Examples:
* Walking: "I am walking to the store."
* Eating: "She is eating dinner."
* Sleeping: "The baby is sleeping. "
Important note:
* The present progressive is formed with the auxiliary verb "be" (am, is, are) followed by the base form of the verb + -ing.
* The base form of the verb stays the same regardless of the subject. For example, it's "walking" for "I am walking," "you are walking," and "they are walking."
Let me know if you'd like more examples or have any further questions.