Sure, here are the sentences with the verbs conjugated in the Present Simple (HTĐ) and Present Continuous (HTTD) tenses:

1. What do you do for a living? (you, do)
2. As a secretary, I write hundreds of letters every week. (write)
3. My boss wants to change jobs soon. (want)
4. Look! She is smoking in the non-smoking area. (smoke)