1)
What is the meaning of "ve'Yesh" in this Pasuk and in Pasuk 21?
1.
Rashi" It means 'and sometimes'.
2)
Why does the Torah insert here "al-Pi Hashem Yachanu ve'al-Pi Hashem Yisa'u"?
1.
Seforno: To teach us that Yisrael did not encamp because they liked the location, nor did they break camp because the location was unpleasant, but because Hashem instructed them to do so.