Sometimes the craft is heavier than air, and sometimes lighter.

有时飞行器比空气重, 有时轻。

Others appeared brighter at times and less bright at others.

而其他行星看上去有时亮些，有时又不怎么亮。

Sometimes it helped, but sometimes it didn't.

有时能见效，但有时不能。

Now and then I do. Now and then I don't.

有时我收费，有时我不收费。

Because sometimes there's two sometimes there's three sometimes four, sometimes five.

因为有时是两个，有时是三个，有时是四个，有时是五个。

There was no acting required on certain occasions.

所以，有时候，完全不用我去表演。

It's something written down – sometimes not even written down.

有时记录成文，有时甚至都没被写下来。

Sometimes the fighting increases, they say, sometimes it slows down.

他们说，战斗有时会加剧，有时会放缓。

I suppose I can be a little bit careless sometimes.

我觉得我可能有时不细心。

Sometimes I go to a video arcade instead.

有时我去录像厅而不去上课。

Sometimes, you can use stative verbs sometimes in the continuous form.

有时候，静态动词有时也能用进行时。

Sometimes they tell their wife, sometimes they don't.

有时他们会告诉他们的妻子，有时候不会。

Sometimes she rides by herself, other times with her husband and children.

有时候独自一人骑行，有时和丈夫孩子一起。

Sometimes government does a good job, they say, and sometimes not.

他们觉得政府有时候做得好，有时候差点。

Sometimes I run with my husband, or sometimes I just go by myself.

有时我和我丈夫一起，有时候就自己去。

Sometimes I would ride my bicycle. Sometimes I would ride my car.

“有时候我会骑自行车。有时我会开车。

Sometimes 'of course' is polite and sometimes it's not.

有时 of course 是礼貌的，有时则不是。

My neighbor's eccentric behavior is sometimes frightening.

我邻居的古怪行为有时令人恐惧。

Sometimes people just lift a finger and that's enough.

有时候，人们只要举手之劳就够了。

For us to identify, let's say a feather or maybe to identify the bones.

我的的鉴别工作有时候会是羽毛，有时候是鉴别骨头。