forth: [OE] Forth can be traced back to the same Indo-European source, *pr, as produced English first, for, fore, foremost, former, from, and before. It formed the basis of a word *prto ‘forwards’, whose Germanic descendant *furtha gave German fort, Dutch voort, and English forth. Modern English forward(s) [OE], which has largely replaced forth in general use, was originally a compound formed from forth and -ward.
Other related forms include afford, which originally meant ‘accomplish, fulfil’, forthwith [14], at first literally ‘along with’, hence ‘at the same time as’ and ‘immediately’, and further. => afford, before, first, for, fore, former, from, further
forth (adv.)
Old English fore "forward, onward, further; continually;" as a preposition, "during," perfective of fore, from Proto-Germanic *furtha- "forward" (cognates: Old Frisian, Old Saxon forth "forward, onward," Old Norse fore, Dutch voort, German fort), from extended form of PIE root *per- (1) "forward, through" (see per). The construction in and so forth was in Old English.
例文
1. She passed the needle through the rough cloth，back and forth .
彼女はその粗布を一針一針縫った。
2.They ate in an Italian restaurant in Forth Street.
彼らは4番街のイタリアンレストランで食事をした。
3.The prosecution and defense were bandying accusations back and forth .
原告と被告は私のところに来て、互いに非難し合っている。
4.Dr.Mesibov set forth the basis of his approach to teaching students.
メシベフ博士は彼の教え方の基礎を述べた。
5.The patient can have apples，apple juice，apple sauce，and so forth .