Stand up. Feet shoulder-width apart. Look at sentence #1. Say it softly. Say it normally. Say it loudly. Now, point at an imaginary person across the room and SHOUT the sentence. Your throat should vibrate. If your roommate knocks, you are doing it right.
Stand in front of a mirror. Read a sentence from the PDF. Watch your mouth. Are you opening your mouth enough? English often requires a wider mouth opening than other languages. Correct your posture and facial expressions. Crazy English Pdf