Here are 10 or more sentences that are poignant and sad in tone, in English:

1、The pain of unrequited love, a sorrowful note of loneliness and regret.

2、Weeping ink touches the soul with sorrowful phrases that seem so painful to describe.

3、Longing for someone you've lost feels like an everlasting silence.

4、With the leaves turning and autumn on its heels, sad memories start to blur in my heart.

5、Each breakup hurts more deeply, yet somehow love becomes even more precious with the sadness that it leaves in its wake.

6、There is an empty space inside that you fill with only longing, missing moments in my lonesome past.

7、Without realizing the truth about how hard our loves would ever hurt us, we grow attached as lovers unaware.

8、My heart breaks in a million pieces each time I recall those beautiful memories, filled with heartache and sorrow.

9、With the last traces of light gone, a quiet sorrow overwhelms me like a shroud of sadness around me.

10、The pain of unrequited love is like a lingering rain that never seems to stop, soaking my heart with sadness and regret.

Each of these sentences captures a different aspect of sadness and heartbreak, making them perfect for expressing a poignant and emotional tone.