These instances do not require a comma. The rule I use is to say the sentence aloud and if a pause is not natural or needed to make the sentence logical then I don't use a comma. Try saying it both ways and you will see that no comma is required.
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candersonThe rule I use is to say the sentence aloud and if a pause is not natural, or needed to make the sentence logical, then I don't use a comma.Haha I should take my own advice!
Dmilton85I'm never sure if I need to put a comma or not.Introductory prepositional phrases never need to be set off by commas, but if they are quite long (more than six or seven words, say), you might consider using a comma if it improves understanding and readability.