句子的一致性：指句子结构完整，时态、语态，语气及句式的一致，举重个部分共同表达一个独立、完整的思想。句子各成分之间的关系应协调，连贯，自然平稳。

　　下面来看一下句子不统一的几种情况：

　　1)句子意思表达不完整

　　× The lecture was given in such an interersting way.

　　√ The lecture was given in such an inereresting way that everyone enjoyed it very much.

　　2)句子的主从关系模糊

　　× We are going to visit John, and he is our English friend.

　　√ We are going to visit John who is our English friend.

　　3) 连接词使用不当

　　× The main reason he was absent was because he was ill.

　　√ The main reason he was absent was that he was ill.

　　4) 主谓不一致

　　× Every teacher and student were invited to go to the party.

　　√ Every teacher and student was invited to go to the party.

　　5) 中心不明白

　　× I was watching a film last night, I suddenly found Mary sitting in front of me.

　　√ When I was watching a film last night, I suddenly found Mary sitting in front of me.