Questions & Answers about Mi multe pensas pri tiu problemo.
Pensas is the present-tense verb form, meaning think or am thinking.
In Esperanto, verbs change by ending:
- -i = infinitive, like to think
- -as = present tense
- -is = past tense
- -os = future tense
So:
- pensi = to think
- mi pensas = I think / I am thinking
Because the sentence has a subject, mi, and gives a complete statement, it needs the finite verb pensas, not the infinitive pensi.
Here multe means a lot or much, and it works as an adverb.
It modifies the verb pensas, not a noun. In other words, it tells us how much the person thinks about the problem.
Compare:
- multa problemo = a big amount of problem / much problem (adjective-like use, modifying a noun)
- mi multe pensas = I think a lot (adverbial use, modifying a verb)
The ending -e often marks adverbs in Esperanto, so multe is the natural form here.