在第4单元，要求你会写简单句、并列句和复合同。和前几个单元相比，你所能得到的帮助更少。
In Unit 4 you will be expected to write simple, compound and complex statements. You will have less help than you had in the previous Units.
按照句子的内部结构进行分类时，可分为简单句、并列句、复合句和并列复合句。
Structurally, they are simple sentences, compound sentences, complex sentences and compound-complex sentences.
按照句子的内部结构进行分类时，可分为简单句、并列句、复合句和并列复合句。
Structurally, they are simple sentences, compound sentences, complex sentences and compound-complex sentences.
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