in[preposition and adverb] 1 indicates position or movement to a location. Come in!2 indicates time: It happened in january.

Grammar patterns1. They enjoyed hiking in the mountains (indicates

position in a place often enclosed or contained)2. I’ll see you in two weeks, in May. (to say when

something happens)3. Have you plugged the computer in? (to indicate that

something or someone is moving to a place that is often enclosed or contained by it).

4. The police burst in on them while they were having breakfast. (it conveys a variety of meanings, many of them idiomatic.)

in Collocations

Common verbs are: arrive in, be born in, deal in, occur in, result in, be used in, involve yourself in, train someone in, interest someone in.Phrasal verbs as in pattern 3: We checked in our bags and went through the customs.(verbs denoting movement) break in, come in, jump in, creep in, crawl in, run in, rush in, etc.Grammar pattern 4: fall in with, go in for, keep in with, zero in on etc. (The English teacher always zero in on our mistakes)Nouns after in: emotions: in love/pain/tears etc.

difficulty: in trouble/danger etc. places: in bed/hospiyal etc. areas: in the north, south etc. times: in autumn, spring etc. dimensions: in height/length

Adjectives followed by in: interested/engaged/involved in lacking/low/rich in fluent/skilled/experienced in dressed/closed in

in Set phrases

In fact …

In case …

In spite of …

The in-thing =the most fashionable thing. e.g. remember when mirror sunglasses were the in-thing?

In any case