1)
What are the connotations of "Asher Tishme'u"?
1.
Rashi: It means 'On condition that 1 you will listen'.
2.
Targum Yonasan: It means 'If you will listen'.
3.
Lev Eliyahu (Sh'mos p.95): The biggest B'rachah is that 'you will listen' - that you will delve into the words of Torah. 2
1
It does not mean simply 'that you will listen'. See Sifsei Chachamim. Lev Eliyahu (Sh'mos p.95)