■有各种各样的书(即书有好坏之分)。

误：There are books or books.

正：There are books and books.

析：用 and 连接两个相同的名词，可表示“许多”或“有各种各 样的”(即有好的也有坏的)。又如：I waited for hours and hours.(我不知等了多少个小时)。

■他说得既不清楚也不正确。

误：He didn’t speak clearly and correctly.

正：He didn’t speak clearly or correctly.

析：在否定词之后两者均被否定的成分要用 or 连接而不用 and。误句的实际意思是：他没有说得既清楚又正确(部分否定)。

■要是他这样说，那他就是个骗子。

误：If he said so, and he is a liar.

正：If he said so, he is a liar.

析：if 引导的是条件状语从句，其后的为主句，其前不能用并列 连词 and(否则全句为并列句)。

■他写过许多书，大部分都很受欢迎。

误：He wrote a lot of books, and most of them being popular.

正：He wrote a lot of books, most of them being popular.

正：He wrote a lot of books, and most of them were popular.

正：He wrote a lot of books, most of which were popular.

析：有 and，全句为并列句，and 后的句子应有完整的谓语。若无and，则全句可能为简单句(如用 being 的一句)或复合句( 如用 which 的一句)。