1.  They have known what they want and what they have to do.

2.  She must know how beautiful she was, since she kept looking into the mirror, appreciating herself from different angles.

3.  We will know how to get along with people who we are not familiar with.

4.  I don't know why I should study English or something.

5.  You won't know how you are great only when you push yourself harder and harder.

6.  We should know how to learn instead of waitting to be tanught, which I think is the biggest difference between high school and college.

7.  We must know what we want to get at college firstly and then make a reasonable choice for ourselves.

8.  Students should know how to use words, not just memorize them, if they want to learn a language well.

9.  We will know how to use the word and how to distinguish one word from the others.

10.  We can know not just how to spell a word but how to and where to use it and this is why repeating is inferior to reading.