帮我看一下这段英语对话的语法需要修改么？ 谢谢

Question

A: hi,xxx I heard that next Monday is xx’s birthday. What can we do for her?
B: How about hold a party for her, and she’ll be surprised in that.
A: oh, that’s a good idea! But what are we preparing next?
B: I’ll call our friends to invent the party. And if you have free time now go shopping and buy something to eat.
A: ok, I’ll go now. bye
B: bye

Answer 1

A: hi,xxx I heard that next Monday was（主谓一致） xx’s birthday. What can we do for her?B: How about holding（介词后需加动名词） a party for her?I think she must be surprised in it.（连词不能滥用，有独立意思的句子要独立成句，最后一个单词指的是这件事用it比较好）A: oh, that’s a good idea! But what should（what are是指是什么） we prepare for （不及物动词，不能省略介词）next?B: I’ll call our friends to plan（计划，策划，你用的单词是发明的意思） the party. If you have free time now,I think you can go shopping and buy something to eat.（假设，用if从句）A: ok, I’ll do it now. bye!B: bye!
如果你是初中以下的，有些看不懂不用在意。你存在一个比较严重的问题，就是对连词掌握不好。对于句子的独立性也要掌握。

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Answer 2

My Dependence

Answer 3

这段话有点像中文式的英语，有些词其实也需要改的A: hi,xxx I heard that next Monday is xx’s birthday. What can we do for her?
B:How about holding a party for her,and she’ll be surprised at that.
A: oh, that’s a good idea!But what should we prepare next?
B:I’ll call our friends to come to the party.And if you have time now you can buy something to eat.