YOU SAID:

i don't know if i should that i will could do this together but only alone i was i should be.

INTO JAPANESE

一緒にやるべきかどうかはわかりませんが、私は一人でしかできませんでした。

BACK INTO ENGLISH

I don't know if we should do it together, but I could only do it alone.

INTO JAPANESE

一緒にやるべきか分からないけど、一人でやるしかなかった。

BACK INTO ENGLISH

I don't know if I should do it together, but I had to do it alone.

INTO JAPANESE

一緒にやるべきか分からないけど、一人でやるしかなかった。

BACK INTO ENGLISH

I don't know if I should do it together, but I had to do it alone.