Option 1: Implied command
* I know you have it. Just give it to me.
This option uses a period after "it" and a comma after "just" to create a two-sentence structure. It implies a more polite command.
Option 2: Direct command
* I know you have it. Just give it to me!
This option uses a period after "it" and an exclamation point after "me" to create a stronger, more direct command.
Option 3: Informal request
* I know you have it, just give it to me.
This option uses a comma after "it" to create a single sentence structure. It suggests a more informal, casual request.
Option 4: Urgent request
* I know you have it; just give it to me!
This option uses a semicolon after "it" to create a single sentence structure, emphasizing the urgency of the request. The exclamation point further strengthens this urgency.
The best punctuation for your sentence depends on the context and the tone you want to convey.