Final answer:
Gatsby's vague language, unreliable storytelling, and inconsistent statements about his past make Nick believe he may be lying.
Step-by-step explanation:
Three habits of Gatsby's speaking that make Nick believe he may be lying about his past are:
- Vague language: Gatsby often speaks in vague terms or evades giving specific details about his past, which makes Nick suspicious.
- Unreliable storytelling: Gatsby tells elaborate stories about his background and experiences that seem too fantastical to be true, leading Nick to doubt their authenticity.
- Inconsistent statements: Gatsby contradicts himself or gives conflicting information about his past, raising doubts in Nick's mind.