Final answer:
Shakespeare mostly adheres to iambic pentameter in his works. This term describes a particular rhythm, measured in small groups of syllables, or 'feet'. In iambic pentameter, each 'foot' consists of two syllables, where the first is unstressed and the second is stressed.
Step-by-step explanation:
The meter that Shakespeare mostly adheres to in his plays and sonnets is iambic pentameter. Iambic pentameter, a type of metrical line used in traditional English poetry and verse drama, describes a particular rhythm that the words establish in that line. That rhythm is measured in small groups of syllables; these small groups of syllables are called 'feet'. In iambic pentameter, each foot is made up of two syllables, the first is unstressed and the second is stressed. The term 'pentameter' indicates that a line of iambic has five of these two-syllable feet, which means the line comprises ten syllables overall. The yarn of 'But, soft! what light through yonder window breaks?' from Romeo and Juliet is one such example of iambic pentameter.
Learn more about Iambic Pentameter