高中英语作文中，使用一些万能金句可以提升文章的表现力和流畅度。以下是一些常用的开头和结尾句型，以及建议、原因和感谢等表达方式：
开头句型
As far as...is concerned就……而言
It goes without saying that不言而喻
It can be said with certainty that可以肯定地说
As the proverb says正如谚语所说的
It has to be noticed that它必须注意到
It's generally recognized that它普遍认为
It's likely that这可能是因为
It's hardly that这是很难的
It's hardly too much to say that它几乎没有太多的说
What calls for special attention is that需要特别注意的'是
结尾句型
From my point of view, it would be better if在我看来......也许更好
It is hoped that we should place much emphasis on/pay more attention to我们应该多注意......
Only in this way, can we只有这样做，我们才能......
It is time to take the advice of … and to put special emphasis on the improvement of …该是采纳……的建议，并对……的进展给予特殊重视的时候了
There is no doubt that enough concern must be paid to the problem of …毫无疑问，对……问题应予以足够的重视
建议和原因
It may be true that …, but it doesn’t mean that …可能……是对的，但这并不意味着……
From my point of view, it is more reasonable to support the first opinion rather than the second. 在我看来，支持第一种观点比支持第二种观点更有道理
In my opinion, it is more advisable to do … than to do ….在我个人看来，做……比做……更明智
This phenomenon exists for a number of reasons. First, … Second, … Third, …这一现象的存在是有许多原因的.首先，……；第二，,……；第三，……
感谢和邀请
I'm very grateful for your help.我非常感谢你的帮助。
I sincerely hope you can join our activity.我真诚地希望你能加入我们的活动。
文化元素
Through learning Tang poetry, you can feel the beauty of the Chinese language.通过学习唐诗，你能够感受到汉语之美。
其他实用句型
An idle youth, a needy age.少壮不努力，老大徒伤悲。
I'm sorry I took so long to reply.很报歉给你回信晚了。
However, few evidence suggests that big companies are willing to invest huge sums of money in places with insufficient basic infrastructure, such as electricity and water.然而，很少有证据表明大公司愿意把巨额的资金投到一个连水电这些基础设施都不完善的地方去。
这些金句可以根据作文的主题和需要进行灵活运用，帮助你在写作中更好地表达自己的观点和看法。