Tuesday
October 21, 2014

Homework Help: English

Posted by rfvv on Tuesday, November 3, 2009 at 1:39am.

1. He has been working hard on the farm for three hours.

2. He has worked hard on the farm for three hours.

(Which one is correct? Are both OK? Which one is commonly used?)

3. They have known each other since they were 13 years old.

4. They have been knowing each other since they were 13 years old.

(#3 is right, but #4 is not right. Right? Do you have rules for that? Would you let me know the website for the rule?)

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