They shall fill your houses (Good News Translation “palaces”) suggests that the king had more than one house (your is singular). And the houses of all your servants means “all your officials.” And of all the Egyptians includes all the people of Egypt, but it may imply that the houses of the Israelites would be spared.

The word as (or “which”) is a relative pronoun that may refer either to the locusts themselves (Good News Translation “They”) or to the destruction the locusts will bring. New Revised Standard Version helpfully places a dash here, followed with “something that,” so that the following clause refers to the entire event described in verses 4-6 (so also New Jerusalem Bible, New Jewish Publication Society’s Tanakh, and New International Version).

Neither your fathers nor your grandfathers means all the “ancestors” of the Egyptians, although the pronoun your is singular. Translator’s Old Testament has “None of your ancestors saw anything like it.” (On “ancestors” see the comment at 2.1 and especially at 3.6.) From the day they came on earth to this day is understood in some translations to refer to when the Egyptians first settled in that land (New International Version, New American Bible). More likely the expression means exactly what Revised Standard Version has, simply adding emphasis to the idea of “never.” Good News Translation omits the entire phrase, depending perhaps too much on the word “ever” to convey this emphasis. In a number of languages it will be necessary to show that the great number of locusts is more than any of the Egyptian ancestors have seen, and translate “more locusts than have ever been seen in this country” or “more locusts than your ancestors have ever seen.”

Then he turned is singular, referring only to “Moses.” There is no reference to Aaron here as there is in verse 3. And went out from Pharaoh uses the verb “to exit,” which complements the verb “to enter” in verse 3. Turned will sound strange in some languages. In such a case one may express this final sentence as “After that Moses left the palace.”

Quoted with permission from Osborn, Noel D. and Hatton, Howard A. A Handbook on Exodus. (UBS Helps for Translators). New York: UBS, 1999. For this and other handbooks for translators see here .