1. Irarely walks in the moutains.
→ Irarely doesn't walk in the moutains.
2. My father reads books every night.
→ My father doesn't read books every night.
3. My sister sometimes rides her the bike in morning.
→ My sister doesn't sometimes ride her the bike in morning.
4. Nam often goes swimming in summer.
→ Nam doesn't often go swimming in summer.
5. I play chess with my brother everyday.
→ I don't play chess with my brother everyday.
6. I play volleyball twice a week.
→ I don't play volleyball twice a week.
Câu 1: Nếu I rarely walk in the moutains ( thêm dấu cách )
→ I don't rarely walk in the moutains.
Dạng phủ định: $S+don't/doesn't+V_{nguyên thể}.$
Dùng $don't$ với ngôi số nhiều $(I,we,you,they,danh từ số nhiều).$
Dùng $doesn't$ với ngôi số ít $(he,she,it,danh từ số ít).$