Which sentence means 'I am familiar with / I am accustomed to working alone'?
1. I am used to work alone.
2. I am used to working alone.
3. I used to work alone.

Question

Answer

1. This construction does not exist. It is grammatically incorrect and has no meaning.

2.  This means 'I am accustomed to working alone.

3.  This means that I worked alone in the past but that I no longer work alone.

Answer

I am used to working alone means that your are accustomed to working alone.

I used to work alone is past tense, meaning that at one point in time you worked alone.