There is a good example script of previous and keywords here,
https://www.botlibre.com/script?id=836109
This is a "response list" file that you can import from your bot's "Training & Chat Logs" page.
You can also create the same responses directly from the "Training & Chat Logs" page by clicking "Add new response", and clicking the "show" checkboxes for keywords and previous.
Conditions are a little more complicated as they involve code. Normally you would use a "condition" with a "think". A condition is a block of Self code that will evaluate to true or false, and the response is only used if it evaluates to true.
For example, consider this "response list",
greeting: Are you a new or existing client?
new
Welcome to our service.
require previous: Are you a new or existing client?
think: speaker.status = "new";
existing
Welcome back.
require previous: Are you a new or existing client?
think: speaker.status = "existing";
help
How can I help?
condition: speaker.status == "existing"
help
Sorry, you need to register first.
condition: speaker.status == "new"
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