– time + ago = time before now
- two years ago = two years before now
– time + before = time before then (before a past time)
- two years before = two years before then
Two years ago, I visited my home town, which I had left two years before.

– time + ago = time before now
– time + before = time before then (before a past time)
Two years ago, I visited my home town, which I had left two years before.

I. Similarity
We can use like or as to say that things are similar
like + noun/ pronoun
We use like to give examples
2. As is a conjunction. We use as before a clause,
an expression beginning with a preposition
as + clause
as + preposition phrase
In formal English like is often used instead of as.
This is very common in American English
II. Function
– All + determiner + noun = determiner + whole + noun
– more common: whole + singular countable noun
– more common: all + uncountable noun
– Above and Over = higher than
A is above/over B
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– Above = one thing is not directly over another
A is above B (not A is over B)

– Over = one thing covers another
A is over B

– Over (Across) = one thing crosses another
A is (moving) over/across B

– Over = more than
– Above = more than in some expressions particularly (vertical scale..)
– Between: Somebody/ Something is between two or more clearly separate people or things

– Among: when somebody/ something is in a group, a crowd or a mass of people or things, which we do not see separately
