How to write English short message format?

SMS has no fixed format. The more casual the better, because westerners don't want to be so orderly in their daily lives. In addition, try to use abbreviations. One is convenience, and the other is that the format should not be too formal. Included in LOL HP 1Once 2 to 26Y4U is too sexual. Here you are, 2Day today, 2 morrow tomorrow, 2 nite tonight.

I won't list them one by one. ...