Common errors with "AFTER"

After a week we're going to Italy
 In a week's time we're going to Italy  
I hope that I'll still be healthy after ten years
 I hope that I'll still be healthy in ten years' time
When you mention a time in the future that is measured from 'now' (the moment of speaking), use in a month's time, in three weeks' time, etc
.'o(or just in a month, in three weeks): 'She'll be back again in a couple of weeks'time 

I promised to meet Hitomi at the exhibition a week after
  I promised to meet Hitomi at the exhibition a week later
I returned to Germany after two years' time
I returned to Germany two years later
When you mention a time in the past that is measured from an earlier time in the past, use a month later, three months later, etc: 'Six
.'months later they got married

After 1961 the consumption of cheese has increased each year  
Since 1961 the consumption of cheese has increased each year
 To refer to a period of time that begins in the past and continues up to
'now' (the moment of speaking), use since (NOT after): 'I've been
.'standing here waiting for you since half past three.' 'She hasn't been to see us since she got married

My first aim is to get a master's degree. After I would like to go and work in Canada  
My first aim is to get a master's degree. Afterwards, I would like to go and work in Canada
A police car arrived within minute s and soon after an ambulancecame
  A police car arrived within minutes and soon afterwards an ambulance came
 After is used instead of afterwards only in informal styles, usually in phrases such as 'soon after', 'not long after' or 'just after'. Careful users
:generally prefer afterwards, especially at the beginning of a sentence
'Shortly afterwards it was announced that the bank had collapsed'
 In American English after is often used instead of afterwards

With Benefit