An unrealized beat regularly occurs at the end of what seem to be trimeter lines in English, and some prosodists would argue that iambic pentameter (at least some of it) is really truncated hexameter, with another beat beyond the end of the line. These unrealized beats occur most obviously in song lyrics, where the words do not provide enough syllables for all the rhythmic beats, as anyone who knows now to sing "The Farmer in the Dell" will understand; only the third line ("Heigh, ho, the dairy-o") fills out the whole line. Hymns and poems that borrow their metrics from hymns may include unrealized beats, as in Emily Dickinson's--

         /        /        /        [/]
The Bustle in a House

           /         /          /        [/]
The Morning after Death

      /        /        /        /
Is solemnest of industries

    /          /          /        [/]       [Where to place the beat on "upon" is hard to decide.]
Enacted upon Earth--

True trimeters exist in English, but poets often have to employ enjambment to keep them closely linked to the following line so that they do not imply an additional beat. Hexameters that tend to fall into pairs of trimeters imply another beat in the middle of the line as in the first line of Yeats's poem:

/          /            /         [/]       /       /       /       [/]
I will arise and go now,   and go to Innisfree,

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