It is certainly true that some teachers talk too much and that this not necessarily advantageous for their students,especially since those teachers are unlikely to be permanently interesting. However, as we shall see in Chapter 5B, it is widely accepted that a vital ingredient in the learning of any language is, of course, exposure to it. The American linguist Stephen Krashen described the best kind of language that students could be exposed to as ‘comprehensible input’, that is language which students understand the meaning of, but which is nevertheless slightly above their own promotion level. Yet where can they go for such language input? Inn the world outside the classroom, English, if they have access to it, will frequently appear incomprehensible,especially when they are at a low level . They need something or someone to provide language which has been ‘roughly-tuned’ to be comprehensible to them. And there is someone right there in the classroom to give them just that!