1.in (in English用英语);
2.on (on foot步行);at (at seven 在七点);in (in the morning在早上);
3.in (in winter在冬天);
4.for (be late for school上学迟到);
5.until/before (not...until/before...直到……才……)
1.in (in English用英语);
2.on (on foot步行);at (at seven 在七点);in (in the morning在早上);
3.in (in winter在冬天);
4.for (be late for school上学迟到);
5.until/before (not...until/before...直到……才……)