as and like

I. Similarity

We can use like or as to say that things are similar

  1. Like is preposition. We use like before a noun or pronoun

like + noun/ pronoun

  • You look like your sister (not .. as your sister)
  • He ran like the wind .
  • It’s like a dream
  • She’s dressed just like me

We use like to give examples

  • He’s good at some subjects, like mathematics
    (not mathematics)
  • In mountainous countries, like Switzerland…

2. As is a conjunction. We use as before a clause,
an expression beginning with a preposition

as + clause

as + preposition phrase

  • Nobody knows her as I do
  • We often drink tea with the meal, as they do in China
  • In 1939, as in 1914, everybody wanted war
  • On Friday, as on Tuesday, the meeting will bee at 6.30

In formal English like is often used instead of as.
This is very common in American English

  • Nobody loves you like I do

II. Function

  1. We use as, not like to say what function a person or things has-
    what jobs people do, what things are used for, etc.
  • He worked as a waiter for two years (not … like a waiter)
  • Please don’t use your plate as an ashtray