Most of the line in shakespeares plays contain?

Most of the lines in Shakespeare's plays contain ten syllables, a pattern known as iambic pentameter. This pattern consists of five pairs of unstressed and stressed syllables, with the stressed syllables falling on the second, fourth, sixth, eighth, and tenth syllables of each line. For example, the following line from Shakespeare's play Romeo and Juliet demonstrates iambic pentameter:

"But, soft! what light through yonder window breaks?"

In this line, the stressed syllables fall on the words "soft," "what," "yon," "win," and "breaks." This pattern of alternating unstressed and stressed syllables creates a rhythmic, flowing quality to Shakespeare's verse.