Chinese phrase
不一定 bù yí dìng
Meaning
not necessarily
When to use it
It says that something is possible but not certain. It gives a careful answer when the result is unclear or may change.
Example dialogue
今天会下雨吗？ jīn tiān huì xià yǔ ma
Is it going to rain today?
不一定，下午可能放晴。 bù yí dìng xià wǔ kě néng fàng qíng
Not necessarily; it might be sunny this afternoon.