这种办法看起来简单，但不一定有效。

Zhè zhǒng bànfǎ kànqǐlai jiǎndān, dàn bù yídìng yǒuxiào.

This method looks simple, but it’s not necessarily effective.

这个药对头疼很有效。

Zhège yào duì tóuténg hěn yǒuxiào.

This medicine is very effective for headaches.

这种学习方法对我很有效。

Zhè zhǒng xuéxí fāngfǎ duì wǒ hěn yǒuxiào.

This way of studying is very effective for me.