"We ask the guard to call the police."
Translation:Vi ber vakten ringa polisen.
I'm still a little confused about this. When do you need to use "att", and when do you not?
No. It's different for each verb, sometimes both are ok, sometimes att is necessary, sometimes you can't have att. There are many cases of all three, and unfortunately you have to learn them from case to case.
Can somebody explain why fragar doesn't work? Is there a difference between fragar and ber? Tack!
So do we have to remember these verbs and whether they take "Att" or not by heart?
I would suggest that you learn that after modal verbs (will, may etc) there is No 'att': Jag ska leka, Jag måste arbeta, Jag brukar arbeta. In other cases I suppose it can be optional ... I have not thought it throu, since it is my native language... :P
I just recently had a discussion about it here: https://www.duolingo.com/comment/7075383$comment_id=7078343
You can find there some good rules when to use att and when not.
I don't understand this solution without "att". According to what I've learned in SFI, this is a bisats and it requires a bisatsinledare. They told us there are 2 things reqired for a bisats: the inledare and that the sats can't stand on its own. How can it then be omitted?