who can translate the following sentences into English? and what differences between them ? please in English.
1他学上英语了，2 他坚持学下去了，3 他学进去了，4他学出来了，5他学回英语，6他学过英语，7他学起英语来了，8他学来学去还是学英语了。

1.he started learning English2.he persevered through it.3.he absorbed well.4.he is already fluent in English now.5.he went back to studying English.6.he has learnt English before.7.He started learning English.8.The only thing he's been studying is English.

<ul class="list-inline text-light-gray no-margin-b"><li><a ui-sref="user({id:comment.commenter_obj.id})" href="https://www.italki.com/user/3228134">Audrey Ma</a>&nbsp;thanks for &nbsp; taking part in my discussion. 6 learn 的过去分词是learned，5，可能有歧义，for example,就他这水平，也算学回英语，回，在此是一次或若干次的意思，也可以是“过”的意思。不是回来学英语的意思。2，我不知道through你用得是否合适，最好让英语是母语的人来评评。1、3、4、6、7、8，I think you are right.but I hope you give a better way to express original ideas.</li></ul>