today
1.It is warm today比Today is warm普通。但Today is Friday和It is Friday today同样普通。
2.该说I shall see him today和I have seen him today，不可在today前面加上on。
3.可以说today's papers（今天的报纸），但不可说today's China，该改作China of today。
4.today在记事里有时指上文说起过的那一天。例如：Today he was more cordial than ever.
5.all today不及all day today合乎习惯。
6.It was just a week ago (today) 和That happened exactly two years ago (today)等句子里用today比不用today语气重。
7.today week=this day week, today month=this day month，参见day 10
8.下面两句意思略有不同：
- I saw him today. （我今天看见他。）
- I have seen him today. （我今天看见过他。）
