of course, as we saw in chapter 2, it is difficult to compare children and adults as second language learners. In addition to possible biological differences suggested by the Critical Period Hypothesis, the conditions for language learning are often very different. Younger learners in informal language learning environments usually have more time to devote to learning language. They often have more opportunities to hear and use the language in environments where they do not experience strong pressure to speak fluently and accurately from the very beginning. Furthermore, their early imperfect efforts are often praised, or at least accepted. older learners are more likely to find themselves in situations that demand more complex language and the expression of more complicated ideas. Adults are often embarrassed by their lack of mastery of the language and they may develop a sense of inadequacy after experiences of frustration in trying to say exactly what they mean. Such negative feelings may affect their motivation and willingness to place themselves in situations where they will need to be the new language.