1704923216
in a few years
1704923217
1704923218
在表示某一天时多用on：
1704923219
1704923220
on Monday
1704923221
1704923222
on the 23rd
1704923223
1704923224
on Christmas Day
1704923225
1704923226
on New Year’s Day
1704923227
1704923228
morning等词若有定语修饰时，前面也需用on：
1704923229
1704923230
on Tuesday morning
1704923231
1704923232
on Friday evening
1704923233
1704923234
on an autumn night
1704923235
1704923236
on New Year’s Eve
1704923237
1704923238
在有this, last, one等词修饰时，这些名词前一般不再加介词，如：
1704923239
1704923240
one day
1704923241
1704923242
this morning
1704923243
1704923244
that evening
1704923245
1704923246
last Tuesday
1704923247
1704923248
next Sunday
1704923249
1704923250
every afternoon
1704923251
1704923252
all day
1704923253
1704923254
any time
1704923255
1704923256
有时也有些习惯用法问题，如：
1704923257
1704923258
by day
1704923259
1704923260
at night
1704923261
1704923262
over the weekend（美国人的说法）
1704923263
1704923264
over the years
1704923265
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