How to use 就像 when the subjects of the two clauses are different?

Question

I'm wanting to say "I'm going to support you as though you were my friend" or "I'm going to support you like a friend", something to that effect. There's probably a more colloquial way of translating this, but specifically I'm trying to use 就像 in this way to learn the grammar. Are any of these following sentences grammatically correct?

(1) 我要支持你，就像你是我的朋友（一样）

(2) 我要就像你是我的朋友（一样）支持你

(3) 就像你是我的朋友，我要支持你

Also, the 一样 is optional, correct?

Thanks for the help.

Answer 1

All incorrect. clause types are mismatched

(1) 我要[支持]你，就像[你是我的朋友一样]

(2) 我要就像[你是我的朋友]一样[支持]你

(3) 就像[你是我的朋友一样]，我要[支持]你

我要就像[支持]朋友一样[支持]你

Answer 2

Not sure in what context you would say that, but you can put it like this:

I will support you in this matter as I would support a good friend.
在这件事上我会像支持好朋友一样支持你。

Answer 3

These are my two sentences.

我會支持你，就像你支持我 - I'll support you as you supported me.

With a little twist, you can say:

我要支持你，就像你曾經支持過我 - I want to support you the way you have ever supported me (before).

You can also say:

就像你支持我一样, 我會/要支持你 - The same as you have supported me, I will/want to support you.

It is maybe a little confusing, but the basic form is "I will do something as you did the same to me", or "The same as you did to me, I'll do it in return."