[译]我们感激你们的邀请。
[误] We are grateful with you of your invitation.

[正] We are grateful to you for your invitation.
[注]表示“为了某事而感激某人”,应该说 be grateful to sb. for sth.,要特别注意其中介词的使用。用于类似结构的词还有 thankful,appreciative 等。