Look at the sentences. In which of them can you only use when?
1. Lady Mary Wortley Montagu wrote about life in Turkey when / while she was living in Istanbul.
2. Lady Mary told people about smallpox inoculation when / while she returned to Britain.
3. When / While Crick and Watson sam Franklin's photos, they knew tey were important.
4. When / While Franklin was doing her research, Crick and Watson were doing similar work.
5. The scientist made one of the tweinteith century's most important discoveries when / while they found the structure of DNA.
While
When
When
While
When
1 Whille
2 when
3 When
4 While
5 when