见得

hé yǐ jiàn dé

何以见得？

How so?

nǐ zěn jiàn dé

你怎见得？

How do you know?

nǐ bù jiàn dé bǐ tā chà

你不见得比她差。

It doesn't seem to me that you are in any way inferior to her.

bù jiàn dé míng tiān huì xià yǔ

不见得明天会下雨。

It doesn't look as if it's going to rain tomorrow.

nǐ zěn jiàn dé tā bù xíng

你怎见得她不行？

How do you know she isn't OK?

nà kě bù jiàn dé

那可不见得。

It is not likely to happen.

bù jiàn dé bù shì zhè ge yàng zi ba

不见得不是这个样子吧？

Who knows if it may be so?