In lines 1 and 2, the phrase “He sowed all day and night” would maintain the same meaning if the determiner “the” were added, as in “He sowed all the day and all the night”.

The past simple of the verb “sow” (line 1) could be written as “soed”.

The phrase “much had he harvested” (lines 3 and 4) would be incorrect if the pronoun “he” were omitted.

In line 1, the verb “came out” could be written as “came away” and maintain the same meaning.

In the verb phrase “night caught him” (line 2) the verb “had” could be correctly added, as in “night had caught”.