How do I spot a rainbow?
user
Rainbows are usually seen when sunlight reflects off droplets of rain. Rainbows are not always visible, however, so this method can be unreliable.  
To make this method more reliable, it’s a good idea to look out for clouds (because clouds cause the rain) and the Sun (which illuminates the droplets in the air).
assistant
How do I spot a rainbow?
user
Rainbows are usually seen when sunlight reflects off droplets of rain. Rainbows are not always visible, however, so this method can be unreliable.  
To make this method more reliable, it’s a good idea to look out for clouds (because clouds cause the rain) and the Sun (which illuminates the droplets in the air).
assistant
How do I spot a rainbow?