When sitting in the Sukkah, we make a brachah of "leishev baSukkah," reflective of the passuk of "basukkos teishvu shiv'as yamim" (Vayikra 23).
Similarly, when putting up a ma'akeh, we make a brachah of "la'asos ma'akeh," as the passuk says, "v'asisa ma'akeh l'gagecha" (Devarim 22).
Why, then, do we say "l'haniach tefillin" instead of "lehakshir tefillin," like the passuk of "ukeshartam l'os al yadecha" (Devarim 6)?
Likewise, why do we say "likvo'a mezuzah" instead of "l'kasev mezuzah," like the passuk of "u'kesavtam al mezuzos beisecha" (Devarim 6)?
Finally, why do we say "l'hafrish terumah" instead of "l'terom terumah," as in the passuk of "tarimu terumah laHashem" (Bamidbar 18)?
All brachos can be found in the Artscroll Siddur.
