1. John can't speak vietnamese fluently
→ John wishes he could speak vietnamese fluently
2. Last night I bought a new shirt
→ A new shirt was bought by me last night
3. 'I am on my way, he said. (REPORTED SPEECH)
→ He said that he was on his way.
4. 'We have studied english for 4 years English
→ English has been studied by us for 4 years.
5. Have you ever eaten this food before?
→ Is it the first time that you have ever eaten this food?