S sound

Level1

a must-have item 필수 아이템

Hawaii is beautiful. -It is a must-visit place.

This movie is good. -It is a must-watch movie.

This book is good.  -It is a must-read book.

This is  delicious     -It is a must-try menu.

                                           *must-verb noun      

Level2 (p.44)

It is very easy to know.

It doesn't take a rocket scientist to know.

                                             to do.

                                             to solve.

That is true. 

I heard it straight from the horses mouth.

                               :당사자

It is not that difficult.

It doesn't take a rocket scientist to know. 

   :필요로 하다