1. 前置词：这讲中,我们出现了一个新的词--后置词. 后置词的概念是和汉语、英语的介词相对等的. 英语中介词称作preposition(前置词). 因为维语是宾语在述语前面,所以英语中前置词(preposition)的概念在维语中成为了后置词这一概念.

2. 介系词：他举例指,介系词(preposition)不应放在句子末,如「Who are you looking at?」正确应为「At whom are you looking?」. 他又指,美国心理学协会指定「since」不可理解为「因为」,只可解作「自从」,但其实两个解释均正确.

3. 介词 ","介词：(八)介词 介词(preposition)又叫前置词,放在名词、代词或相当于名词的词前面,表示它后面的词与句子中其它成分之间的关系. 介词在句中一般不重读,也不能单独作句子成分. 介词根据其构成,可分为简单介词,如:in, at, for, since等;

1. 介词；前置词
A preposition is a word such as 'by', 'for', 'into', or 'with' which usually has a noun group as its object.

e.g. There is nothing in the rules of grammar to suggest that ending a sentence with a preposition is wrong.
语法规则中并没有规定句子以介词结尾是错误的。

noun

1. a function word that combines with a noun or pronoun or noun phrase to form a prepositional phrase that can have an adverbial or adjectival relation to some other word

2. (linguistics) the placing of one linguistic element before another (as placing a modifier before the word it modifies in a sentence or placing an affix before the base to which it is attached)