其实如果你只想要应付的话 你就可以说
Your speech is great, but is still a lack of self-confidence.
你的演讲很棒，但还是缺乏自信
You sound good, but not enough solid basic skills.
你的声音不错，但是基本功不够扎实。
Your language is very fluent, but speech is not enough deep understanding of the content
你的语言很流畅，但对于演讲内容的理解还不够深刻。
The language of your organization, the voices are very good, also very confident, I really like
你的语言组织，声音都很不错，也很有自信，我很喜欢
一般后面可以加一句
I hope you continue to work
希望你继续努力
或者
I look forward to your next performance
我期待你下一次的表现
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