Is this rule correct? when 'for' and 'since' are used in a sentence(in present perfect tense) to show duration of an action they imply that the action is still in progress. Without the 'for', the ...
A: Is Mr. Bob at home? B: Sorry, he isn't at home. He___to Hong Kong for vacation? A. went B. has gone C. is going Which one is correct answer? and why it is not the other ones?
Are the answers I chose correct. My choices are in bold. I have been pumping/I have pumped up three tyres. Would you like to do the forth? I have been greasing/I have greased my car. That's why my ...
could you possibly enlighten me about any differences between 2 sentences below: (a) I went to Warsaw this year. (b) I have been to Warsaw this year. Thank you very much in advance!