To find the word with a different stress pattern from the others, we need to identify the primary stress in each word. Here are the analyses for each set:

1. **A. condition** (con-DI-tion)
**B. vegetable** (VE-ge-ta-ble)
**C. tomato** (to-MA-to)
**D. surrounding** (sur-ROUND-ing)

The word with a different stress pattern is **B. vegetable**. The primary stress is on the first syllable, while the others have stress on the second syllable.

2. **A. healthy** (HEALTH-y)
**B. affect** (af-FECT)
**C. harmful** (HARM-ful)
**D. tidy** (TI-dy)

The word with a different stress pattern is **B. affect**. The primary stress is on the second syllable, while the others have stress on the first syllable.

3. **A. physical** (PHYS-i-cal)
**B. actively** (AC-tive-ly)
**C. serious** (SE-ri-ous)
**D. Japanese** (Ja-pa-NESE)

The word with a different stress pattern is **D. Japanese**. The primary stress is on the third syllable, while the others have stress on the first syllable.

So, the answers are:
1. B. vegetable
2. B. affect
3. D. Japanese