如果您想用英语写生日邀请函，以下是一些提示和建议：

首先，应该始终使用礼貌和友好的语气。您可以使用一些句式和表达来表达您的感激和期望，例如：

- 'I would be honored if you could join me on my special day.'

- 'Your presence would make my birthday celebration even more special.'

其次，您需要指定日期、时间和地点。确保您提供了足够的信息，以便您的客人能够轻松地找到场地。您可以使用以下格式：

- 'Please join me on [date] at [time] at [location].'

- 'My birthday celebration will take place on [date] at [time] at [location].'

您可能还想考虑包括一些其他信息，例如主题或着装要求，以及是否需要带来礼物。在这种情况下，您可以使用以下表达：

- 'The theme for my birthday is [theme]. Please feel free to dress accordingly.'

- 'I kindly request that you do not bring any gifts, as your presence is the greatest gift of all.'

最后，您应该以一种礼貌和感激的方式结束邀请函，并再次感谢您的客人考虑参加您的生日庆祝活动。您可以使用以下表达：

- 'Thank you so much for considering my invitation. I hope to see you soon!'

- 'I would be thrilled if you could join me on my special day. Thank you for your time and consideration.'