1. You can’t end a sentence with a preposition 不能以介詞結尾
?(she enjoys being fussed over.她喜歡被簇擁的感覺)
?(they must be convinced of the commitment that they are taking on.他們必須明確自己要承擔的責任。)
?(Tom had no-one to play with.沒有人可以和湯姆一起玩)
Who、where、what打頭的問句：questions beginning with who, where, what, etc.
(what music are you interested in?你喜歡什么樣的音樂？)
2. You can’t start a sentence with a conjunction 不能以連詞開頭
Conjunctions are words such as and, but, so, and if, which are used to connect clauses, sentences, or words. This grammatical superstition arises from the thought that because these words are used to connect separate clauses.The argument against using and or but to introduce a sentence is that such a sentence expresses an incomplete thought (or ‘fragment’) and is therefore incorrect. However, this is a stylistic preference rather than a grammatical rule.
3. Double negatives are always ungrammatical 雙重否定不符合語法規則
When two negatives are used to communicate a negative, then the usage is ungrammatical. The reason for this is that two negatives actually cancel each other out and create an affirmative statement. For example, the sentence ‘I don’t have nothing for you’is ungrammatical because the presence of two negatives technically switches the meaning to an affirmative one, so that it means ‘I have something for you.’
當兩個否定詞匯一同使用時，這種用法是不符合語法規則的。原因是兩個否定實際上互相抵消，表達肯定的含義。例如，這句話“I don’t have nothing for you”不符合語法，因為嚴格意義上來講這兩個否定詞匯在一起表達了肯定的含義，表示“我有東西給你”。
Even though the use of double negatives in formal speech and writing is nonstandard, the use of double negatives is common in areas such as informal speech and popular music.
However, there is one use of double negatives that is entirely grammatical. In this use, the double negative is used to express and reinforce an affirmative.
I couldn’t not help him. [meaning: I strongly felt I should help him]
4. Splitting infinitives is a mistake 不定式不能分隔使用
For the uninitiated, splitting infinitives is the practice of placing an adverb between ‘to’and the corresponding verb, as in ‘to lightly tap.’Splitting infinitives is a common peeve of grammar enthusiasts, but like many such peeves it has been employed by well-regarded English prose stylists for centuries. However, take care before splitting those infinitives; many style guides and professors would still consider this a stylistic error.
對外行人來說，分裂不定式是在to和之后的動詞之間放置一個副詞，如“to lightly tap（輕拍）”。分裂不定式對語法愛好者而言是個常見的讓人苦惱的問題。但是有很多著名的英文散文家喜歡使用分裂不定式的寫作方式。不過，要小心使用分裂不定式，仍然有文體書和專家認為這是文體錯誤。
She used to secretly admire him.
You have to really watch him.
Those who believe that split infinitives are grammatically incorrect would rewrite these sentences as:
She used secretly to admire him.
You really have to watch him.
5. You can’t start a sentence with hopefully ?hopefully不能作為句子開頭
This use of hopefully to mean ‘it is hoped’rather than the adverbial ‘in a hopeful manner’has been disputed in the past several years, though it has found its way into general acceptance.
Hopefully and thankfully can’t be reworded along the lines of other sentence adverbs, using the constructions ‘it is hopeful that’or ‘it is thankful that’:
Hopefully 和thankfully和其他句子副詞不同，可以使用‘it is hopeful that’ 或者‘it is thankful that’的結構
Hopefully, planning delays will be minimal.
It is hopeful that planning delays will be minimal.
It is to be hoped that planning delays will be minimal.