After all

Typical mistake: 

We had a nice party with drinks and dancing; the, after all, we went home. 

'After all' does not mean 'finally'. 

... then, finally, we went home (Or: ... when everything was over, we went home). 

'After all' has two meanings: 

1. 'In spite of what was said before' or 'contrary to what was expected'. 

I'm sorry I can't come after all. 

I thought I was going to fail the exam, but I passed after all. 

With this meaning, after all usually comes at the end of a clause. 

2. 'We mustn't forget that...' This is used to introduce an important argument of a good reason, which the person who is listening seems to have forgotten. 

I think we should let Linsay go camping with her boyfriend. 

After all, she's a big girl now. 

It's not surprising you're tired. After all, you were up until three last night!

Used like this, after all usually goes at the beginning of a clause.