离合词【líhécí】

A separable verb (离合词) looks like one word but is built from a verb and its object: 睡觉 is literally "sleep a sleep", 见面 "see face", 帮忙 "help with a task". Anything that would go between a verb and its object goes between the two halves.

The common ones: 睡觉, 见面, 帮忙, 生气, 结婚, 毕业, 洗澡, 游泳, 跳舞, 唱歌, 上课, 下班, 聊天, 散步, 请假.

了, 过 and amounts go in the middle

• × 我睡觉了八个小时 → 我睡了八个小时的觉
• × 我们见面过 → 我们见过面

No second object

A separable verb already has its object, so it can't take another. The person goes in front with 跟 or 和, or inside the verb with 的.

• × 我想见面你 → 我想跟你见面
• × 他结婚了她 → 他跟她结婚了
• × 请帮忙我 → 请帮我一个忙
• × 我毕业大学了 → 我大学毕业了

帮助 and 学习 look similar but are ordinary verbs, so 帮助我 is fine.

Doubling

To double a separable verb, double only the verb half.

• × 我们去散步散步吧 → 我们去散散步吧