1)
To whom do the (otherwise superfluous) words "ve'Amarta lahem" apply?
1.
Rashi: It is a warning to Beis-Din (to ensure that the people parpicipate). 1
1
Which they did by instituting the annual half-Shekel ans takng a security from whoever fails ro comply. Oznayim la'Torah.
2)
What are the implications of "Shenayim la'Yom"?
1.
Rashi #1: It implies literally two per day.
3)
Why does the Torah say "Olah Tamid" and not 'Olas Tamid' (construct)?
1.
Riva: Sometimes the Torah inserts a 'Sav' in place of a 'Hey' (the construct form, where it is not applicable), here the Torah has done the rePasuk.