Переход окраски в водных растворах от красной к оранжево-жёлтой наблюдается в области рН 3,1-4,4 (в кислой среде красный, в щелочной — жёлтый).
1. Have you ever bought a piano?
2. When did you buy the piano?
3. Have you ever been to London?
4. When were you in London?
5. Have you ever spoken to a pilot?
6. When did you speak to the pilot?
7. Have you ever seen the film?
8. When did you see the film?
The a a the the the the the a the a the the a a
was, watched, went, had, visited, bought, ate, took, interviewed, didn't go, stayed, didn 't come out, stopped