What these examples show is that a phrasal verb’s meaning is not derived from it’s individual words but from the specific combination of those words together. The following three factors are therefore integral to the identification of phrasal verbs:
(1) A phrasal verb must contain a verb and a preposition or particle (or both).
(2) A phrasal verb will change its meaning if any word is removed.
(3) The meaning of the phrasal verb as a whole cannot be guessed from the meanings of the individual words.
Why are phrasal verbs difficult?
In addition to the fact that a phrasal verb’s meaning cannot be outright guessed and must be learned phrase by phrase, there are three reasons that phrasal verbs are particularly difficult for students of English.
1. Commonality
Phrasal verbs are very common in the English language, especially in informal speech and fiction. By some accounts, roughly one in every five hundred words ever spoken or written in English is a phrasal verb, which means that if a student wishes to better understand or improve their English proficiency, they will have to become confident with using this type of construction. To make the situation even harder, there are many hundreds of phrasal verbs for a student to learn.
2. Similarity
Similarity is another reason that phrasal verbs are often tricky for non-native speakers. For example, from one construction such as ‘put out’, there may in fact be multiple different phrasal verbs (homonyms), with each possessing different meanings and grammar yet the same pronunciation and spelling: