すら/ですら => even ~ (with emphasis) N1
ながす => glance through N2
Demonstrate by example
さすがに => understandably N2
Base, base
のが~です => to be N4
すら,ですら => Even A N1
(Not)only , (Not) even
さすがの...も => even ~also N2
The highest (comparative) level
...たいんですが => want N4
How to say the beginning
がわかります => Capacity N5
Ability
んですが => opening the story N4
さすが => as one would expect N2
Evaluate
... のが...です => Highlight interests and skills N4
Abilities, interests
がする => to smell; hear; or taste N4