1. 全倒装句：把整个谓语动词完全移到主语之前
例：Here comes the postman. 这里的谓语comes完全移到了主语the postman前面,所以是全倒装.



2. 半倒装句,即：部分倒装句：只把谓语的一部分（如助动词、情态动词等）移到主语之前,或把句子的强调部分提前.
例：Only once was John late to class. 这里只是将助动词(be动词)was移到主语John前面,而实意动词late仍在主语后面,所以是部分倒装,即半倒装句.

注意：以否定词开头的句子要“半倒装,如：no, not, never, seldom, little, hardly, at no time, in no way, not until等词在句首,句子要倒装.
例：Not until yesterday did little John change his mind.直到昨天小约翰才改变了主意.
Never have I seen such a performance.

如果否定词不在句首,则句子不倒装.
例：I have never seen such a performance.