Explanation:
In this sentence, we are talking about a future event that will happen before a specific time. The correct answer is "will not be."

Explanation:
When we talk about future events, we use the modal verb "will" to express a future action or state. In this case, the speaker is referring to their presence or absence at a certain time in the future.

Subject-Verb Agreement:
The subject of the sentence is "I," and the verb is "be." In English, the verb "be" has different forms depending on the subject and tense. In this case, since the subject is "I" and the sentence is in the future, we use the future form of the verb "be," which is "will be."

Negative Form:
To make a negative sentence, we add the word "not" after the verb "will." So, in this case, the negative form of "will be" is "will not be."

Use of "There":
The word "there" in this sentence is used as an adverb to indicate a place or location. In this case, it refers to the location where the speaker will not be present before 10 o'clock.

Time Reference:
The phrase "before 10 o'clock" indicates the specific time by which the speaker will not be present. It implies that the absence will occur prior to that time.

Overall Meaning:
Putting it all together, the sentence "Don't wait for me, I will not be there before 10 o'clock" means that the speaker is informing someone not to expect their presence before 10 o'clock because they will not be there. It suggests that the speaker will not arrive at the designated location before the specified time.