Like in most cultures, native English speakers often use informal vocabulary when speaking in normal conversations. Learning the common informal phrases makes it easier, however, many students do not realize this until they get to a high level. Colloquial phrases are extremely common in native conversations and are necessary for advanced English.

Phrasal verbs are the most important collocation because these are commonly used in everyday English. Phrasal verbs include a verb and an adverb or a preposition. If these phrases are not recognized, it can be a problem because phrasal verbs are commonly used by native English speakers. Sometimes, translation devices are not correct when translating phrasal verbs.