Wǒ bù huáiyí tāde nénɡlì.

我不怀疑他的能力。

I don't doubt his abilities.


Notes:

我(wǒ): I

不(bù): not

怀疑(huáiyí): to doubt

他的(tāde): his

能力(nénɡlì): ability

Example:

A：我不怀疑他的能力。

     Wǒ bù huáiyí tāde nénɡlì.

     I don't doubt his abilities.

B：我也是。

     Wǒ yě shì.

     Me too.