What is the proper placement of the adverbs of frequency in the sentences?

Here are the sentences with the adverbs of frequency placed correctly:

1. He often helps his mum with the shopping.
2. Do you often watch TV?
3. We are sometimes late for school.
4. Is he always so nervous?
5. I never have classes in the evening.
6. I never read in bed.
7. They are always busy.