1. I got an invitation to the party yesterday.

2.  A solution to the problem has been found

3. I have to pay some more money an addition to the sum

4. I refused his demand for money

5 His need for help is very imoprtant 

6.   You are the reason for her visit

7.  My love for mum is so tender and deep

8.  He is on the business trip now

9.  Mary is on her summer holiday in Paris.

10.  I'm speaking on the telephone now.