想必

zhè shì xiǎng bì nǐ shì zhī dào de

这事想必你是知道的。

You most probably know this.

tā xiǎng bì shì yǒu shì zhǎo nǐ ba

他想必是有事找你吧。

He is probably looking for you about something.

xiǎng bì nǐ de huà shāng le tā de zì zūn xīn

想必你的话伤了她的自尊心。

Your words most probably hurt her self-esteem.

tā méi yǒu dá fù xiǎng bì shì méi yǒu shōu dào wǒ de xìn

他没有答复，想必是没有收到我的信。

No word from him yet, so presumably he hasn't received my letter.

xiǎng bì nǐ yǐ zhī dao zhè ge xiāo xi le ba

想必你已知道这个消息了吧？

Presumably you've knew the news?

xiǎng bì rú cǐ

想必如此

think it must be so

guó yǒu qǐ yè xū shàng jiǎo gèng duō lì rùn xiǎng bì shì yòng yú zài fēn pèi

国有企业须上缴更多利润，想必是用于再分配。

State-owned enterprises are required to pay more into public coffers, presumably for redistributive purposes.