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It is difficult to see how one can teach if one is not learning. But there are some distinctions ...

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however difficult  how difficult  whatever difficulty  what difficulty  
was; was raining  is; has rained   is; is raining  will be; will rain  
how difficult does it seem    however it seems difficult    however seems it difficult    how difficult it seems  
However difficult the problem was    Whatever difficult the problem was    However difficult was the problem    No matter how difficult was the problem  
is raining    rains    was raining    has rained  
How    How an    What    What an  
What, to see    How, seeing    What, seeing    How, to see  
was; was raining    is; has rained    is; is raining    will be; will rain  
how often you go to see a film    how long you do your homework    how much time you spend on your hobbies    how soon will you go to see your grandparents  
how to do with    what to deal with    how dealing with    how to deal with  
that; what  which; what  that; how  which; how  
difficult    more difficult    most difficult    the most difficult  
How to survive, is    How does he survive, are    How does he survive, is    How to survive, are  
However difficult English is    No matter how difficult is English    However English is difficult    No matter how English is difficult  
difficult    more difficult    most difficult    the most difficult  
How great fun; to see    What a great fun; seeing    What great fun; to see    How great a fun; to seE.  
is…was raining    was…had rained    is…is raining    was…was raining  
No matter how English is difficult  However difficult English is  No matter English may be difficult or not  However English is difficult  
What a    What    How    How a  

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