In spoken English, the way you use stress and intonation matters a lot. Stress means emphasizing certain syllables. Intonation means the rise and fall of the voice in speaking. Together they bring out the meaning of the words in sentences and help convey attitude and emotion in an utterance. They are the key to understanding and being understood while speaking. In English classes, we should also emphasize learning how to say things rather than learning what to say only. In this way, we can enable our students to sound as natural as possible in speaking and become confident speaker of English.
