In his plays, Shakespear used mostly ____.

- William Shakespeare composed much of his plays in the form of poetry. Often in a meter called iambic Pentameter.
- He wrote total 37 plays.
- His plays have 5 acts.

Iambic Pentameter:
- A rhythmic Pattern. Pentameter means a group or unit of five people or five things.
Blank Verse:(অমিত্রাক্ষর ছন্দ) It's an unrhymed iambic pentameter. It's a kind of poetry without rhyme at the end. এসব কবিতার বৈশিষ্ট্য হলো অন্তমিল বা কবিতার শেষে ছন্দের অনুপস্থিতি।

On the other hand, the other two options in the question are:
- Couplet: (দ্বিপদী শ্লোক) Two lines of verse rhyming together. (equal length and rhyme).
- Quatrain: It is a stanga ( division of poem). a piece of verse complete in four rhymed lines.

Source: Britannica.com and Website upcoming content