用go it alone表达“只身单干”

to go it alone用来形容某人做某事是自己一个人去做，没有其他人的帮忙。

• Now that I have enough experience, I‘ve decided to go it alone and start my own business.
• I‘m not ready to go it alone yet. I need another few years working in this company.
• We don‘t need your help with the project. We‘ll go it alone and see what happens.

值得注意的是，如果某人feels alone，就是说他感到很孤单，形单影只、感到孤助无援。

• After she left me, I felt completely alone.