Yes, these sentences all sound natural! Here’s a quick breakdown of their tones:
* "Suppose I leave right now. Would you have time to go with me?" – Sounds thoughtful and hypothetical, slightly formal.
* "Let's say I leave right now. Would you have time to go with me?" – Casual and inviting, commonly used in conversation.
* "Say I leave right now. Would you have time to go with me?" – Very casual, sounds direct and conversational.
* "Imagine I leave right now. Would you have time to go with me?" – Adds a bit of creativity, suggesting a scenario for consideration.
All work well depending on the tone you want!