一位网友想知道如何区分及物动词和不及物动词以及谓语动词和非谓语动词。要想区分及物动词和不及物动词，首先要判断动词后是否需要接直接宾语。谓语动词和非谓语动词的主要区别则在于动词在句中的成分以及它是否会因人称和时态的变化而变化。

In the preparation of this book we deeply acknowledge the help and advice of a number of colleagues of our Departamento de Filología Inglesa (Lengua Inglesa), Universidad de Sevilla, Spain. A vote of ...

Imagine trying to speak without expressing possibility, permission,or necessity; it would be like painting without colour. That’s were the modal verb step in. These special helping verbs—can, could, ...