this (used to refer to a specific thing or person nearby)

this (used to indicate a specific time or event)

यह

English Usage: This was the moment we had been waiting for.

Hindi Usage: यह वह क्षण था जिसका हमें इंतज़ार था।

this one (referring to a specific item)

this (used in questions)

यह

English Usage: Is this what you were looking for?

Hindi Usage: क्या यह वही है जिसे आप खोज रहे थे?