to do it alone
Me pregunto si Tom podrá hacerlo solo o no.
I wonder if Tom will be able to do it alone or not.
I can't do it on my own.
Don't let him do it alone.
Estoy acostumbrado a hacerlo solo.
I'm used to doing it alone.
I usually do it alone.
Sólo tú puedes hacerlo, pero no puedes hacerlo solo.
Only you can do it, but you can’t do it alone.
¿Todavía crees que serás capaz de hacerlo solo?
Do you still think you'll be able to do it on your own?
¿Estás seguro de que quieres hacerlo solo?
Are you sure you want to do it alone?
I've decided to do it alone.