"I'll come back ASAP" means you will physically return to someone as soon as possible. "I'll get back to you ASAP" means you will respond to someone's request/communication as soon as possible. Choose whichever is most appropriate for your situation.
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Pamela81now I know that it is --a-- nonsense (no 'a')Right. As mentioned above, you need 'get'.
Pamela81when you have taken a decisionThis is OK for British English. If you want American English, write "when you have made a decision".
Pamela81but for me it is much more natural to say "take a decision" because I translate from Italian :-)OK, but be careful. One of these days you're going to 'take a crab', and no one will know what you're talking about.
Pamela81I found on a dictionary : "crock" or "foolish thing" for nonsense. Are these words synonyms?They are somewhat like synonyms. I advise against "crock" completely. It suggests a container full of what you find in a toilet. Don't use that.