Present Perfect Simple. For and Since

You know we use the present perfect simple for actions and events that started in the past and continue in the present.
For example, if we say this blog has been on the Internet for four months, we mean that it's still on line.
Now let's revise the difference between two important time expressions we usually find in present perfect sentences: for and since. We use for to express the duration of an act and we use since to refer to the specific point in time when the act started.
Read these examples:
I've played football for two years
or
Now it's 2012 and I've played football since 2010.
Now match time expressions to for or since.