lucas21c There is no 'for' in front of 'three days' and 'a week'. No, you cannot do that.
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lucas21cThere is no 'for' in front of 'three days' and 'a week'.No, you cannot do that.
lucas21cIf it is right,Marginally; at least, I understand it.
lucas21c could you tell me when I can drop 'for' and when I cannot?No; it is a mystery to me.