我怀疑他偷了我的手机。

Wǒ huáiyí tā tōu le wǒ de shǒujī.

I suspect he stole my phone.

我怀疑食物是被老鼠偷吃了。

Wǒ huáiyí shíwù shì bèi lǎoshǔ tōuchī le.

I suspect the food was eaten by a mouse.

我怀疑我怀孕了。

Wǒ huáiyí wǒ huáiyùn le.

I suspect that I'm pregnant.