有时候我怀疑他是在装糊涂。

Yǒushíhou wǒ huáiyí tā shì zài zhuānghútú.

Sometimes I suspect he’s just playing dumb.

我经常忘记把东西放在哪里了，我应该有点老糊涂了。

Wǒ jīngcháng wàngjì bǎ dōngxi fàng zài nǎlǐ le, wǒ yīnggāi yǒudiǎn lǎohútú le.

I often forget where I put things—I must be getting a bit senile.

别再犯同样的错误了，那样太糊涂了。

Bié zài fàn tóngyàng de cuòwùle, nàyàng tài hútu le.

Don't make the same mistake again; that's too careless.