Here are the corrections for each sentence:

**Question 30:**
Mistake: **"her"**
Correction: **"his"**
Corrected: She always is punctual, but his friend is always late.

---

**Question 31:**
Mistake: **"putting"**
Correction: **"put"**
Corrected: Let’s put those new chairs for our guests in the dining room.

---

**Question 32:**
Mistake: **"are"**
Correction: **"is"**
Corrected: It is called the Tiger room because there is a tiger on the middle of the wall.