Intensifiers such as so, most, very, or really generally only make sense when they're modifying qualifiers, as in:
- very quickly walked—makes sense
- bows most courteously—makes sense
- interrupted really stupidly—makes sense
If you've done the lesson on adjective groups, you might remember that you can also use intensifiers on describer adjectives as in:
- the very quick walk—makes sense
- a most courteous bow—makes sense
- some really stupid interruptions—makes sense
On the other hand, intensifiers usually sound strange, or even don't make sense, when applied directly to verbs:
- very walked—doesn't make sense
- bows most—hmm...
- interrupted really—hmm...
In contrast to intensifiers, qualifiers such as tightly, quickly, or fast can operate directly on a verb, for example:
- tightly stretched—makes sense
- quickly answered—makes sense
- runs fast—makes sense