1/ she was ill ,so she stayed at home. -> she stayed at home because she was ill

2/ they wrote that letter. -> their letter was written by them

3/ the ticket are expensive so she can't buy them.( Too)

the ticket are too expensive for her to buy.

4/ my group has 50 people

-> there are 50 people in the group

5/ we poissed the last train

-> we weren't late for the last train

6/ I spent 3 days writing its conclusion. -> it took me 3 days writting its conclusion

7/she like reading book

->she is keen on reading book

8/ i can't find a more expensive restaurant than this one. -> it is the most expensive restaurant i can find

9/ they have been friends for 10 year. -their friendship started 10 years ago.

10/ wearing glasses feels strange to me -> i am not used to wearing glasses