Here are the identified errors in the sentences provided:

1. **You don't *need* to eat *do* *quickly*! *It's* not a *compete*.**
- **Error:** "do" and "compete"
- **Correction:** The word "do" should be removed. "Compete" should be replaced with "competition."
- **Corrected Sentence:** "You don't need to eat quickly! It's not a competition."

2. **She *training* hard *for* the race, sometimes *running* as *much* as 60 miles a week.**
- **Error:** "training"
- **Correction:** "training" should be changed to "is training."
- **Corrected Sentence:** "She is training hard for the race, sometimes running as much as 60 miles a week."

3. **He risked *to lose* his house *when* his *company* *went* bankrupt.**
- **Error:** "to lose"
- **Correction:** "to lose" should be changed to "losing."
- **Corrected Sentence:** "He risked losing his house when his company went bankrupt."

4. **He has *been* playing *champion* tennis *for* three years *now*.**
- **Error:** "champion"
- **Correction:** "champion" should be changed to "championship."
- **Corrected Sentence:** "He has been playing championship tennis for three years now."

5. **He *gave* me a *play* slap *on* the *shoulder*.**
- **Error:** "play"
- **Correction:** "play" should be removed or replaced with "playful."
- **Corrected Sentence:** "He gave me a playful slap on the shoulder."

In summary, the errors and corrections for each item were outlined, providing clarity and accuracy to the sentences.