1. Increase the volume of the syllable.
2. Lengthen the duration of the syllable.
3. Change the pitch of the syllable.
In English, stress is usually indicated by a raised pitch on the stressed syllable. For example, in the word "banana", the first syllable is stressed, so it is pronounced with a higher pitch than the second syllable.
Stress can also be indicated by a stronger articulation of the syllable. For example, in the word "dog", the first syllable is stressed, so it is pronounced with a stronger emphasis than the second syllable.
Finally, stress can also be indicated by a longer duration of the syllable. For example, in the word "computer", the first syllable is stressed, so it is pronounced for a longer period of time than the second syllable.
By combining these three techniques, you can effectively stress a syllable in English.