1. UK or US:
British and American English have plenty of differences – in spellings, vocabulary
and grammar. Choose which one is right for your audience and then use it
consistently.
2. Since and
for: Don't make the common mistake that both of these can be used as a
replacement for the Swedish “sedan.” How to remember which to use when? Use “since
+ a specific point in time” (e.g. I’ve been an engineer since 2012) and use “for
+ a duration of time” (e.g. I’ve been an engineer for 2 years).