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Could anyone recommend me a grammar book that can help me solve these grammar problems below? They have bothered me for a long time, but because of my poor english, I haven't figure them out. You don't need to answer these questions. (You can if you please, and I will appreciate your kindness.) 1.in vs. of I'm always confused about which one should I use. For example, "the clubs of the school are excellent.", and "the clubs in the school are excellent." these two sentences are both no problem for me, but I think only one of them is correct, so I would like to know how can I know which one is correct. 2.single form vs. plural form Taking a sentense for example, "We have a pen", does this sentense mean that "there is only one pen, and we have it." or that "there are three pens. I have one, you have one and he has one."? I mean, I know we should use plural nouns if there are more than one. but what if I say "We have pens"? It also confuses me because how can I know whether it means "I have more than one pen, you have more than one pen, and he has more than one pen, but my pens are mine, your pens are yours, his pens are his", or that "There are some pens. They are mine, but they are yours, too."? How can I know when should I use plural nouns or single forms? I know it's a basic question, but what I want to realise is the question I am mentioning. If anyone can recommend any book or website that is helpful for me to figure out these questions, thank you very much. -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 140.119.129.58 ※ 編輯: davidwu0123 來自: 140.119.129.58 (01/09 17:12) ※ 編輯: davidwu0123 來自: 140.119.129.58 (01/09 17:13)