`43`. Carnival is a popular festival in many countries in South America. Nevertheless, I have never attended it.
- although + S + V: mặc dù
- nevertheless, S + V: tuy nhiên
`44`. A hydro power station was built in the North of the country last year
Cấu trúc câu bị động thì quá khứ đơn: S + was/ were Ved/PP (+by O)
`45`. The problem of energy shortage will be solved by using solar energy next decade
Cấu trúc câu bị động thì tương lai đơn: S + will be Ved/PP (+by O)