1.Learn to pronounce sounds
2. Drill sound pairs
3. Use stress correctly
STRESS IMPORTANT WORDS AND DISTRESS THE REST
How to decide what is important?
You’ll probably hear it from the sentence context. But if to put it in rules:
Content words are normally stressed – nouns, main verbs, adjectives, adverbs.
Function words are normally unstressed – articles, pronouns, auxiliary verbs, prepositions.