1. Yeah, right. 2. You're kidding. 3. You're pulling my leg. 4. That's a bit of an exaggeration. 5. He's stretching the truth. 6. He's not telling the whole truth. 7. She's being economical with the truth. (= she's lying or not telling the entire truth) 8. His story is fishy. 9. That's an outright lie. 10. That's a pack of lies.
Listen to news bulletins and songs in English to listen to the pronunciation of words. You can also learn new words and expressions this way. The more you listen, the more you learn! Try copying what you hear to practise your pronunciation and learn which words in a sentence are stressed.