① It is not without reason that he complains.

② No one can fail to notice the great changes of that city.

③ You can never hurt another without hurting yourself.

④ No problem is so difficult but it may be solved.

= No problem is so difficult that it may not be solved.

⑤ There is not one of us but wishes to help you.

⑥ I don’t know but it is all true.

⑦ Nobody can be sure but that she is right.

⑧ I don't doubt but that he will do it.

⑨ The amazing progress made in science nowadays is such that hardly a day passes without our reading in the newspaper some accounts of a new discovery or invention.

⑩ It was not there. I was not in the least surprised. I am never surprised when I do not find things in my pockets. Long experience has taught me not to expect to find what I want in my pockets. But on the other hand, I rarely fail to find things I do not want.

【バットを飼い慣らす動画】https://youtu.be/jCxrbgjlqRY