The four tones,
one by one
High and flat
Stay high and level throughout. Think of a sustained musical note, or the sound you make when a doctor asks you to say "aah". Do not let it drop or rise.
Rising
Start mid-pitch and rise sharply to the top, like asking a question in English: "Really?" The rise should be confident and reach a clear high point.
Dipping
Start mid, dip down low, then rise again. In natural speech before another syllable, it often only dips without rising fully. This "half third tone" is normal and correct.
Falling
Start high and fall sharply to the bottom. Like giving a sharp command in English: "Stop!" or "Now!" It should feel decisive and short.
The neutral tone · 轻声
The neutral tone (also called the fifth tone or 轻声 qīngshēng) is short, light and unstressed. It appears in syllables that have lost their original tone in connected speech, most commonly in particles, suffixes and the second syllable of certain words. Examples: 吗 (ma), 呢 (ne), 吧 (ba), 爸爸 (bàba), 妈妈 (māma). You do not need a special pitch for it, just say it quickly and lightly after the preceding syllable.
Same sound,
different meaning
These four syllables show how a single sound can mean four completely different things depending only on tone. Getting the tone wrong does not just make you sound foreign, it changes what you actually said.