He couldn't join the party because he was busy.
He won't be able to join the party because he will be busy.
I could settle my own problems.
I will be able to settle my own problems.
1)a,2)c,3)d,4)b вроде так
On last May holidays I was in Turkey! I went there with my family) It was very interesting and funny holiday. Every day we swam in the pool and the sea. There was a lot of exotic food. Every day I have tried a new one) I spend a lot of time with my family and new friends. So three days ago we went home back. It was the best holiday in my life
I am from Russia. It is a beautiful country. Here there are a lot of things you can see.
For example the Red Square. Here are very friendly people and neighbors. Russia is a very beautiful country.