翻译如下：
free of charge
免费的意思。
我每次在购买笔的时候可以免费赠送胶水吗可以说：Can I get glue free of charge every time when I buy a pen?
Each time I buy a pen,there is a bar of glue given to me free of charge.
疑问句
Is there a bar of glue given to me free of charge each time I buy a pen?
祝你开心如意！
Could you please give me a bottle of glue free of charge when I buy pens every time?
或者
Can I get a bottle of glue free of charge when I buy pens every time?
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