① 有些动词在汉语中是不及物动词，在英语中是及物动词，可能多一个介词。如：serve for the people, follow after him, play with her in a match, marry with her, engage with her
② 有些动词可作及物动词，也可作不及物动词，但搭配不同，可能混淆而多一个介词。如：join in the game, 但 join in the club; pay for a TV set, 但 pay for three dollars; search for the map, 但 search for the thief for his watch
③ 有些“动词 + 介词”形式的动词后面没有宾语时，后面的介词是多余的。如：
He looked at but could see nothing.
How are you getting on with?
④ 有些动词、名词、形容词后接名词或代词时须加一个介词，但接that从句时，必须去掉介词。如：agree to it, 但 agree to that...; be sure of it, 但be sure of that…; be sorry for it, 但 be sorry for that…
⑤ 有些副词或介词词组后加一个介词，组成了复合介词，若后面没有接宾语时，最后的介词则是多余的。如：
If you won’t go, I’ll go instead of.
He walked out of.
⑥ 有些连词后加 of 成为复合介词，如果后接从句，of 是多余的。如：Because of he was ill…
⑦ 地点副词的意义中已经包含了介词 to，如果再用 to则是多余的。如：on my way to there, get to home, go to upstairs, return to home
⑧ last year, next month, this week, one day等名词词组直接充当时间状语，前面用介词是多余的。
⑨ 有些动词受汉语意思影响而多一副词，如：stop down(停下来), raise up (举起来), return back(归来，回来), repeat again (复述)
⑩ 有些动词在一种用法中要加副词，而在另一种用法中加副词则是多余的。
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