English language uses collocations, lexical chunks, and idioms that frequently occur together in pairs or groups, rather than just individual words. Collocations refer to groups of two or more words that commonly go together, such as "do business" or "catch a bus", even if the reason for their grouping is not obvious. Lexical chunks are fixed or semi-fixed strings of words that behave as a single unit, like "over the moon" or "nice to see you". Idioms are phrases where the overall meaning cannot be understood from the individual words alone, such as "full of beans" meaning energetic. These multi-word expressions can be difficult for learners due to their idiomatic nature.

1. WORDS TOGETHER
Students frequently worry about the meaning of individual words. However,
English language is far from putting together strings of individual words
because English language uses collocations, lexical chunks and idiom that
frequently occur together in pair of groups.

2. Examples:
 do business
 do the cooking
 get married
 save money
 catch a bus
 take a taxi
COLLOCATIONS
It refers to a group of two or more words that usually go together. However,
there is often no reason for collocation.
CO meaning together.
LOCATION meaning place.
Verb+Noun combination= COLLOCATIONS

3. LEXICAL CHUNKS
They are strings of words which behave almost as one unit.
Some of these are fixed (which means you cannot chane any word)
 Over the moon
 Out of the blue
Some of them are semi-fixed (which means you can change some words
Nice to see you
Good to see you
Great to see you

4. IDIOM
It is a lexical phrase where the meaning of the whole phrase may not be
comprenhensible even if we know the meaning of each individual
word.
Examples:
 Full of beans = Energetic
As plain as the nose on your face = Obvious
Many phrasal and multi-word verbs cause problems for learners precisely
because they are idiomatic.