LIKE = similar to, the same as. You cannot use as in this way
- You have a huge house! It’s like a palace (not as a place)
- You love romantic films, like me (not as me)
- I love eating in the garden. It’s like being on holiday. (not as being)
- It’s raining again! I hate weather like this (not as this)
In these sentences, like is a preposition, so it is followed by a noun ( like a palace), a pronoun (like me/this) or -ing ( like being)
Sometimes we can use like = for example
- Some people, like my dentist, run half marathons once a week.
Note: We can also use such as = for example
- Some people, such as my dentist, run half marathons once a week
AS = in the same way as, or in the same condition as. We use as before the subject + verb
- As I said at the meeting last week, I think we should revise our sales forecasts.
- If you had done as I said, we wouldn’t be in this situation.
Note: we can use Like in the above examples in informal spoken English, NOT written English.
- Like I said at the meeting last week, I think we should revise our sales forecasts.
Compare as and like in these sentences:
- You should have done it as I showed you (or like I showed you – spoken)
- You should have done it like this. (not as this)
As can also be a preposition, but the meaning is different to like. Let’s take a look:
- As an English Language Trainer, I have many lessons to prepare. (As a trainer =in my position as a trainer)
- Like my teaching colleagues, I have many lessons to prepare. ( Like my teaching colleagues = the same as my colleagues)
As (preposition) = in the position of, in the form of
- A few years ago I worked as a financial adviser.
- We haven’t got a separate office, so we use the fourth bedroom as an office.
- London is wonderful as a city to visit, but I wouldn’t want to live there.