1. The west lake is the largest in Ha Noi.
-> No lake in Ha Noi is as large as the west lake.
2. They have lived here for 15 years.
-> It's 15 years since they lived here.
3. Are there 60 teachers in your school?
-> Does your school have 60 teachers?
4. She likes to live in the Countryside.
-> She enjoys living in the Countryside.
-> She is interested in living in the Countryside. ( be interested in = be keen on = be fond of )
5. Our energy will soon end because we don't try to save it.
-> Our energy would soon end if we didn't try to save it.