Vocab: arvama - to think
to think; to believe; to be of the opinion; to suppose; to reckon; to consider something to be true (even without certainty)
Building blocks
arva- → root related to opinion/guessing (arvamus – opinion)
-ma → infinitive ending
So literally arvama means: "to form an opinion"
⚠️ arvama vs. mõtlema: if you can replace "think" with "believe" or "reckon", use arvama — if it's more like "ponder" or "think about", use mõtlema.
How to use it
What to remember
The thing you think or believe is expressed as an et-clause (a "that"-clause)
Example
Arvan, et see on hea mõte
Literally: “I-think that this is good idea”
Idiomatically: “I think this is a good idea”
Arvan - Verb – 1st Person Singular, Present Tense: "I think"
et - Conjunction – Indeclinable: "that"
see - Pronoun – Nominative Singular: "this"
on - Verb – 3rd Person Singular, Present Tense: "is"
hea - Adjective – Nominative Singular: "good"
mõte - Noun – Nominative Singular: "idea"


