你说的是never后面还有六个空还是一句话总共有六个单词？
如果是never后面还有六个空的话，可以参考：
He never has been to see a dentist. 有六个空的话，只能用现在完成时态了。 强调他从未去看过牙医。
如果一句话总共有六个单词的话，可以参考：
He never goes to the dentist.
He never (goes to see the dentist ).
He never __ __ __ __(他从不看牙医)六个空，怎么写?
He never visited the dentist before.
He never goes to the dentist at all.
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