In English grammar, the word 'when' is primarily used as a conjunction or an adverb to indicate the time or the condition under which an action or event occurs. In Hindi, 'when' can be translated as 'जब' (jab) or 'कब' (kab) depending on the context.
Here are a few examples:
1. When I arrived, they were already eating.
मैं जब पहुंचा, वे पहले से ही खाना खा रहे थे।
2. Tell me when you are ready.
जब आप तैयार हो तो मुझे बताएं।
3. I like to go for a walk when the weather is pleasant.
मुझे सैर पर जाने का शौक है जब मौसम सुहावना होता है।
4. When you study hard, you will achieve success.
जब आप मेहनत करेंगे, तब आप सफलता प्राप्त करेंगे।
In Hindi, 'जब' and 'कब' can be used interchangeably in many cases, but 'जब' generally implies a specific moment or event, while 'कब' refers to an indefinite or general time.