免费 + 的 + Noun / 免费 + Verb
免费 (miǎnfèi) means "free of charge" and is used as an adjective or adverb to indicate that no payment is required. It is placed before a noun or verb. For example, 免费服务 means "free service" and 免费提供 means "to provide for free."
这个博物馆周末免费开放,我们一起去吧。
zhège bówùguǎn zhōumò miǎnfèi kāifàng, wǒmen yìqǐ qù ba.
This museum is open for free on weekends; let's go together.
商家为了吸引顾客,推出了免费试用的活动。
shāngjiā wèile xīyǐn gùkè, tuīchū le miǎnfèi shìyòng de huódòng.
To attract customers, the merchant launched a free trial promotion.
这个软件可以免费下载,功能也很齐全。
zhège ruǎnjiàn kěyǐ miǎnfèi xiàzài, gōngnéng yě hěn qíquán.
This software can be downloaded for free, and its features are quite comprehensive.