Verb after gerund verb [duplicate]

I'm newer to this forum, and I'm learning English. My teacher has taught me that we must use gerund after "enjoy", as in:

I enjoy swimming.

Now, if we use a verb after gerund, which verb should I use: base from or infinitive or gerund? for example:

1. I enjoy helping you improve your English.

2. I enjoy helping you to improve your English.

3. I enjoy helping you improving your English.

Thanks in advance.

[1] I enjoy helping you improve your English.

[2] I enjoy helping you to improve your English.

[3] *I enjoy helping you improving your English.

"Help" permits only an infinitival complement (bare or with to), but not a gerund-participial one.

So [1] and [2] are correct, but not [3].