According to these two theories, only in certain syntactic structures can a lexical item be semantically and grammatically right in a phrase, clause or sentence.
这两个理论认为，当使用于短语、从句或句子中时，词项只有在特定的句法结构中才能语义正确、合乎语法。
For a certain lexical item, its argument structure or valency structure determines its syntactic structure.
对词项而言，主目结构或配价结构决定句法结构。
'BE' is widely used in English and is related with many other syntactic rules and therefore the use of 'BE' is a very important item in grammar acquisition.
BE在英语中应用广泛，涉及众多语法规则，因而有关BE的使用是英语中一个很重要的语法习得项目。
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