lend, keep, buy, borrow这四个词都是动词,但意思不同:
lend意为“借出”,常与介词to连用。例如:
You mustn't lend the book to others. 你一定不要把书借给别人。
keep意为“保留,保存”。例如:
You can keep this book for three days. 这本书你可以借三天。
buy意为“买”。例如:
I am going to buy a computer next year. 明年我打算买一台电脑。
borrow意为“借入”,常与from连用。例如:
I often borrow books from the library. 我经常从图书馆借书。