"When You Are Old" by W.B. Yeats

内容：这首诗描绘了诗人对爱人的深情，描述了她年老时的形象以及诗人对她的无尽思念。

诗句

```

When you are old and grey and full of sleep,

And nodding by the fire, take down this book,

And slowly read, and dream of the soft look

Your eyes had once, and of their shadows deep；

```

"How I Love You"

内容：这首诗表达了诗人对爱人的深沉情感，通过歌词传达了他内心的痛苦和无奈。

诗句

```

How do I say I love you？ How do I tell you I care？

How do I tell you I've missed you and let you know I'm here？

```

"Thoughts of You" by Corwin Corey Amber

内容：这首诗描绘了诗人对爱人的无尽思念，表达了希望与她共度一生的愿望。

诗句

```

Thoughts of you dance through my mind.

Knowing, it is just a matter of time.

Wondering... will you ever be mine？

```

"Without You" by Elle Kimberly Schmick

内容：这首诗通过对比有和无爱人的状态，表达了诗人对爱人的深切依赖和渴望。

诗句

```

Without you？ I'd be a soul without a purpose.

Without you？ My emotions would have no heart.

```

"Trees" by Nelson Antrim Crawford

内容：这首诗通过自然景象的描绘，表达了诗人对爱人的复杂情感，既有赞美也有无奈。

诗句

```

Trees, pines the slow measure of the chanted war song...

The storm cloud, dull throbbing black against the sky...

The lover constant though unloved.

```

这些情诗都以各自独特的方式表达了诗人对爱人的深情和思念，适合作为中长篇英文情诗的参考。