1. We often hide our phones-we don't want him to ruin them or grow too dependent on them but he almost always tracks them down once he hears the ring or the buzz of an incoming message.

本句是一个复合句，主句是由 but引导的并列的句子。破折号后面 we don't...on them是对we often hide our phones的目的的补充说明。其中 or引导两个并列的动词短语。once引导时间状语从句，其中or连接两个并列的名词短语。

语法重点：并列结构，时间状语从句

2. And when we pick up the phone or check messages, that only makes our son want the phone more, since he always wants whatever is in our hands.

本句是一个复合句，主句是 that only makes our son want the phone more. when引导时间状语从句，since引导原因状语从句，其中whatever引导的名词性从句作want的宾语。

语法重点：时间状语从句，原因状语从句，名词性从句

3. The AP recently ran a story on how more parents are downloading kid-friendly apps, such as white noise and rattle sounds and easy video games, to their cellphones.

本句是一个复合句，其中how引导的名词性从句作on的宾语。such as表示举例。

语法重点：名词性从句