text: Students frequently use a preposition with verbs where it is not needed. This may happen because there is confusion between a regular transitive verb which is not a phrasal verb and a similar noun which does need a preposition. Here are some examples:
  This error may be due to confusion between the verb emphasise (transitive; no preposition) with the noun emphasis (often followed by the preposition on).
  Semantic prosody describes the phenomenon in which certain seemingly neutral words can be perceived with positive or negative associations through frequent occurrences with particular collocations
  To impose means to force people to do something they do not like. When native speakers use the verb impose, they use it with nouns like ban, tax or (unpopular)law giving a negative connotation. Chinese speakers often use impose with a neutral object like scheme or policy. In this case they should use a neutral verb like introduce or implement.
  Native speakers use the verb improve with nouns that are not negative in meaning. Chinese learners often use improve with a negative noun such as unemployment or air pollution. They should use a noun that is neutral in meaning.
  This verb is usually followed by nouns/noun phrases that are negative. Chinese learners often collocate it wrongly with nouns that are positive in meaning.