what I do in the evenings.

你们好！

晚上的时候，我一般看书，上网，也学习中文。

你们都晚上喜欢做什么?

I've put this into google translate and it translates into not very good English - but is it understandable Chinese?

It‘s surprisingly a really good translation, but if you wanted to make it a more elaborate sentence I would include 一般. It means generally

what I do in the evenings.

你们好！

我晚上看书，上网，学习中文。

你们晚上都做什么?

I've put this into google translate and it translates into not very good English - but is it understandable Chinese?

    Your Chinese is good!!!

what I do in the evenings.

你们好！

我晚上看书、上网、学习中文。

你们（在）晚上都做什么?

I've put this into google translate and it translates into not very good English - but is it understandable Chinese?

I can understand. 我在晚上也是看看书、上上网、看看英文的电影。