=>

1. His life was hard at that time. However, he studied very well./His life was hard at that time; however, he studied very well.

2. We planned to visit Petronas in the afternoon; however, we could not afford the fee./We planned to visit Petronas in the afternoon. However, we could not afford the fee.

3. I've been too busy to answer by email; nevertheless, I'll do it soon./I've been too busy to answer by email. Nevertheless, I'll do it soon.

4. The new restaurant looks good. However, it seems to have few customers./The new restaurant looks good; however, it seems to have few customers.

5. We had planned to walk right round the lake, but the heavy rain made this impossible.

6. I had an umbrella, but I got very wet in the rain.

7. The fruits were green; nevertheless, he ate them all./The fruits were green; nevertheless, he ate all of them.

Nevertheless ~ However : tuy nhiên

But : nhưng