请帖已经发出去了，不过你也可以在网上报名参加活动。

Qǐngtiě yǐjīng fāchūqù le, búguò nǐ yě kěyǐ zài wǎngshàng bàomíng cānjiā huódòng.

The invitations have already been sent out, but you can also sign up for the event online.

我昨天收到了她的婚礼请帖。

Wǒ zuótiān shōudào le tā de hūnlǐ qǐngtiě.

I received her wedding invitation yesterday.

请把你的地址发给我，好让我寄请帖给你。

Qǐng bǎ nǐde dìzhǐ fā gěi wǒ, hǎo ràng wǒ jì qǐngtiě gěi nǐ.

Please send me your address so that I can mail you an invitation.