Generally cash advances do not have an interest free period.

通常提前支取现金不享受免息期。

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You can transfer credit card balances once the initial interest free period is up to another card, and so continue your interest free credit.

你可以传递初始一旦信用卡余额免息期最长的另一卡等你继续免息贷款。

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And he pays off the debt during the interest-free period, "so that I don't pay extra for my purchases".

通常他在免息阶段就把债务还清了，他说：“这样一来我就不用付额外的费用了”。

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It found quoted rates of APR can vary according to whether interest is charged on interest, and whether there is an interest-free period.

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Store cards don't pose a problem if you are disciplined enough to pay off the balance within the interest-free period (typically between 35 and 55 days).

BBC: NEWS | Business | Understanding store card debt

For instance, Apple offers customers up to 18 months interest-free on purchases on a card from Barclaycard US. But if you don't pay off that specific purchase in the interest-free period, you'll face a variable annual percentage rate that's currently about 23%, according to the Apple website.

WSJ: 12 Debt Myths That Trip Up Consumers