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.