请帮我改正这句子

1. 过来 = 这棵树有上百年的树龄了，树干很粗，（谁能切得过来呢）？
2. 过来 = 老师说我文章里的错别字比较多，（所以我最近都忙改正不过来）。
3. 过来 =
A：刘阿姨帮着照顾孙子就够累的了，下个月她女儿的孩子又要出生了。
B：是啊！（等下她女儿的孩子出生了就不能帮过来照顾孙子）。

Veja uma tradução

1. 这棵树有上百年的树龄了，树干很粗，（谁能【砍】 得过来呢）？
【切】can be used with something much smaller than trees, like fruits.【砍树】means[cut down the trees]
If you want to express [who can cut it down?or who has the ability to cut it down?] you can say【谁能砍得下来呢】
If you use【谁能砍得过来呢？】it's not suitable in this sentences, it means [there’re so many trees that i can cut them all.]

2. 老师说我文章里的错别字比较多，（所以我最近都【忙着把这些错别字改过来】or【忙得改不过来】）。
Emm, actually, this is weird. If you want to express that you are busying with correcting those mistakes, you can say 【忙着把这些错别字改过来】
If you want to express that you are busying with other things and couldn't correct the typo，you can use 【忙得改不过来】

By the way,I recommend【忙着把这些错别字改过来】
Because【忙得改不过来】is still weird in this sentence.

3.
A：刘阿姨帮着照顾孙子就够累的了，下个月她女儿的孩子又要出生了。
B：是啊！（等下她女儿的孩子出生了就不能【过来帮忙】照顾孙子【了】）。

【过来帮忙】means [come and help ]


PS:I saw this question before, but without【用 “ 来 / 过来” or “动词 + 得/不 + 过来"】，i just can’t understand.


Hope this can help you.