是不是也我我一样为这几个拉丁缩写用法而烦，看看下面解释和比较分析，就知道它们有什么不同区别，
i.e.
- that is (stands for id
est from Latin). You can also
use it to substitute, “in other words.”
etc.
- and so on, and the rest (abbreviation for etcetera).
e.g.
- for instance, for example (abbreviation for exempli gratia in Latin). Remember e.g. by thinking of
it as “example given” and then follow it with a few examples. e.g. apples,
oranges, bananas.
et al means roughly “and others”. It is written at the end of a list of names to indicate that others are related to the same subject. In legal terms, it probalby means that the one who signs is not the only responsible for whatever he’s signing, but there are others with the same/related responsibility.“The investigation was carried out by Estell Lynch, James K, John Doe et al.” means John Doe and some others (could be partners, collaborators, relatives, heirs, etc.).
Rule #1: Don’t use e.g. and
etc. together because you wouldn’t use for instance (meaning as an example) and
then use and so on (meaning others); both phrases imply the names you named were
just a part of a group. For example, “e.g. apple, oranges, etc.”
Technically,
you can probably use “i.e. apples, oranges, etc.” since it’s says “that is,
apples, oranges, and so on.”
Rule#2: Use periods as they’re abbreviations.
Easier
workaround: instead of using the abbreviation, use “for example” or “that is”
and you can rarely do wrong.
Since et means and, avoid using and with etc. ect is not the same thing.