I will support you. 我会支持你的。

I'll back you up. 我会挺你的。

I'm on your side. 我站在你这边。

You can count on me. 你可以依靠我。

You can rely on me. 你可以依赖我。

You can trust in me. 你可以信赖我。

I'll be available if you need me. 你需要帮助就可以找我。

I'll be there if you need a hand. 你需要帮助时，我就会出现。

I'm a phone call away. 我随call随到。

I'm with you all the way. 我一直都支持你。