いちがいに…ない => Impossible... in general N2
Description
にちがいない => I'm sure/ certain; no doubt that ~ N2
Speculation
がちです/がちになる => A tends to become/happen/occur N2
Potential, Possibility
に[違「ちが」]いない => Without a doubt, A N2
Information, Report
と([思「おも」]う、[言「い」]う、[考「かんが」]える) => That A N4
Particles
ようと思う/ようと思っている => thinking of doing; planning to ~ N3
と思う => I think N5
ひとつまちがえば => Just (negligence) N3
Ability
と思っている => Plan to do something N4
Plan
~みこみちがい / みこみはずれ> => ~Contrary to expectations N1
Beyond expectations
かと思ったら/かと思うと => just when; no sooner than ~ N2
がち => tend to; tendency to; frequently; often; to do something easily. N2