Here are the errors and corrections for each sentence:

1. **Error:** "want buy"
**Correction:** "want to buy"
**Corrected Sentence:** "We don’t want to buy any writing pads?"

2. **Error:** "lived here for 5 years ago"
**Correction:** "have lived here for 5 years" (remove "ago")
**Corrected Sentence:** "They have lived here for 5 years."

3. **Error:** "don’t like, too"
**Correction:** "don’t like it, either" (or just "either")
**Corrected Sentence:** "Mr. Long doesn’t like drinking green tea and I don’t like it, either."

4. **Error:** "like bananas, or my brother doesn’t."
**Correction:** "like bananas, and my brother doesn’t."
**Corrected Sentence:** "I like bananas, and my brother doesn’t."

5. **Error:** "will has"
**Correction:** "will have"
**Corrected Sentence:** "Lan will have a small party for her next birthday."

Overall, the corrections make the sentences grammatically correct and improve their clarity.