Usage of "so", "very" and "too" working as adverbs.

[Abraaocoutinho]

Is there a rule to use those adverbs? For example in the senteces:
1-The coffee was so hot that I couldn't drink it.

2 -There were far too many people there.

3- He is very ill.

Thanks.

[Ralf]

Hi abra,

These words are intensifiers and usually precede an adjective.

When I lay eyes on her for the first time, I was completely lost for words.

You could omit the intensifier without being ungrammatical. But you'd loose the stress/emphasis.
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[Sara Simo]

hey Ralf

did you mean lose or loose?

I get confused

I am an ESL student by the way.

so I need your answer