1. 句子不完整

　　句子缺少主语或谓语。

　　误：Because some necessary procedures such as transporting the factories, modifying equipment or planting more trees.

　　2. 句子缺少连词

　　两个句子之间不能只用逗号连接，要有连词。

　　误：My sister loves to dance, she is very good at it.

　　3. 句式不平行

　　句子中并列的成分应该是相同的结构。

　　误：I like to eat Japanese and eating Thai food.(eating-> eat)

　　误：Teenagers are more influenced by their peers than their parents.(than their parents-> than by their parents)

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