1.The last time she wrote home was five months ago.
->She hasn't written home  for five months
2.He started working for this company two years ago.
->He has worked for this company for two years
3.I spent one hour going to work by bicycle.
->It took me one hour to go to work by bicycle
4.Be careful or you will make mistakes.
->If you aren't careful, you will make mistakes
5.He can't speak because he is so angry.
->He is too angry to speak
6.They will built a new hospital here.
->A new hospital  will be built here
7.It's not easy to do all this work in half an hour.
-.I find it diffcult to do all this work in half an hour
8.Shall we go to the disco tonight?
->What about going to the disco tonight?
9.He can't cook as well as his sister.
->His sister can cook better than him