What is the difference between schon, längst and tatsächlich?
Ich gehe schon/längst/tatsächlich zur Arbeit.
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"Ich gehe schon ...":
"schon" is used when you are doing something earlier than pretended.
1a) It is used for the explanation that one is already able/allowed to do something. Like when an infant would say
1b) can also be used when you are earlier in the means of daytime:
"Ich gehe längst ...":
like "schon" but way more exagerated. Can also be used together.
2a) Like the kid was very astonished that the others didn't know it already a long time is old enough for school.
2b) Your wife reminds you that you may be late for work and you respond
"Ich gehe tatsächlich ...":
3) "tatsächlich" means "indeed". The only case when you would say that is, when someone is pretending you are doing something and you agree.