I'm going to have to say "no." When we teach ESL, we pay equal attention to reading, writing, speaking, and listening. Although this doesn't occur in every lesson, over the term we work in activities to practice these skill sets. What's more, whole books have been devoted to the methodology for each skill, and discussions have raged--yes, raged--on how to teach reading, writing, speaking, and listening through discussion boards like this.
We can work grammar and vocabulary into any activity to practice one of these skills. But both are mere tools to successfully accomplish a written exercise, for example, or a role-play.
Let's look at two students, neither of whom we would consider to have yet mastered English.
Student A can speak very well. In fact, he has given a few presentations in English for work. His listening skills, though, are quite poor. In a conversation, especially a phone conversation, he often loses the thread of what is being talked about.
Student B reads the paper every morning. She keeps a journal for new vocabulary words, which she checks regularly. In a conversation, although she can understand everything, she can't get her ideas out fast enough. She is always a few steps behind the discussion, and so rarely can voice her ideas and opinions.
Language is a tool for communication, and both students have trouble achieving that end. Much more than grammar and vocabulary go into getting one's ideas across.
Chris Cotter
www.headsupenglish.com