1. Our English classes are usually interesting.
Our English classes aren’t usually interesting.
Are our English classes usually interesting?
2. We hardly ever speak Russian.
We don’t hardly ever speak Russian.
Do we hardly ever speak Russian?
3. Our teacher is never late.
Our teacher isn’t late.
Is our teacher never late?
4. We sometimes listen to English songs.
We don’t listen to English songs.
Do we listen to English songs?
5. I always do my homework.
I don’t do my homework.
Do I always do my homework?
6. We often have tests.
We often haven’t tests.
Do we often have tests?
Не знаю правильно
2) HC ≡ CH + H2→CH2=CH2
3) CH2=CH2 + HBr → CH3CH2Br
4) 2CH3CH2Br + 2Na →CH3CH2 CH2CH3 + 2NaBr
5) CH3CH2 CH2CH3→CH3-CH-CH3
CH3