teaser
1. It will be easy to fall into the verb trap if you do not follow the word's implication threadbare.
2. If there is a subject of the Ed word, then it will be only a verb and not a modifier. If it is a modifier, then a comma from the subject should have separated the 'Ed'. Here in the given case, the tempo increased and therefore it is certainly a verb and not a modifier. Whether it is a status verb or an action verb is the next point.
Therefore, there is no way that 'increased' can act as a modifier in the given example.
3. Please go into the aspect of various types of verbs by googling. There are some verbs, which are both action and status verbs.
Status verbs emanate from within while action verbs require some effort. For example,
1. Appear ---- The witness appeared (status) nervous when he appeared (action) in the court
2. Feel ---- He felt(S) excited when he felt the soft touch of his newly born baby.
3. Grow --- The plant grew luxuriantly when the experienced gardener grew in his backyard.
4. Look -- When we looked (A) at the distant mountains from the window of our hotel, they all looked(S) verdant.
5. Remain --- He remained(S) calm as he remained (A) waiting for the exam results.
6. Smell --- The jasmine flower smelt(S) strong as I smelt (A) it form closeby.
7 Sound ---- The alarm sounded(S) ominous, as the siren sounded (A) loud from the lighthouse top.
8. Taste -- The Mulgoba mangoes from Salem, India tasted(S) sweet when I tasted (A) them along with my family
9. Double: The gas doubled(S) its volume when Tom doubled (A) the electricity input into the apparatus.
You can see that some verbs are both status and action verbs. You must study the context to distinguish whether the result is due to an effort or is from within.