1、 I'm now writing on behalf of the classmates to invite you to come and attend it, if you can spare the time.
我代表同学写信邀请您来参加，如果您能抽出时间的话。
2.、I sincerely invite you to watch the show because...
3、 You can reach me through my phone number 87654321 at your convenience.
您可以在您方便的时候打我的电话，号码是 87654321。
假定你是李华，你班同学决定为小明举办生日聚会，请你写信邀请外教Susan参加，要点包括：
We're throwing a surprise party for Xiaoming's birthday. As scheduled, all the classmates in our class will gather at the Students' Centre at 8 pm this Friday evening to celebrate Xiaoming's birthday. We would feel much honored if you could come and enjoy it, which is to finish at 9, lasting an hour.As the party starts, we will light the candles and sing "Happy Birthday" for him. Then the birthday cake will be presented and cut for all of us to enjoy, following which we'll sing songs and play some small games. What's more, as a surprise, we'll all prepare some secret birthday gifts for him, and it'll be great to see how surprised he will be seeing the gifts. As it's a surprise party, he will know nothing about it beforehand, and we do hope that you could manage to attend it.
Looking forward to your coming.
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