It is a possibility that he will start a course.
There is a possibility that he will start a course.
We sat on different tables.
We sat at different tables.
It's difficult to see how does the second person feel.
It's difficult to see how the other person feels.
If I would be afraid about the symptoms I will ask my friend.
If I were afraid about the symptoms I would ask my friend.
My dad do nothing in the kitchen.
My dad does nothing in the kitchen.
People are concentrated with stress a lot.
People are concentrated on stress a lot.
There was families who said they had been there before.
There were families which said they had been there before.
She gave me some good advices.
She gave me some good (pieces of) advice.