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__来 __去 Structure

back and forth, again and again

游来游去

走来走去

飞来飞去

想来想去

看来看去

Grammar on 在​

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Chinese characters can not conjugate. 吃 (chī) will always remain as 吃 (chī) regardless of when you eat. 

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Adverb of time is definitely the clearest way to determine the time when the action occurred.

In order to indicate that the action belongs to simple present tense (habitual actions) use the followings:

每天               měi tiān                         every day

每周/每个星期měi zhōu/měi gè xīng qí     weekly

每年               měi nián                       every year

有时               yǒu shí                       sometimes 

If you want to express that the action is present continuous tense (currently in progress), use

现在     xià zài            now

example: 现在几点了？

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We can use auxiliary verbs 在 (zài) to express present continuous tense/on-going action.

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在 (zài) does not have a particular meaning. However, it holds an important role as a progressive marker.

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Structure: Subject + 在 + Verb + Object

我在看电视。

Wǒ zài kàn diànshì.

I am watching TV.