に[越「こ」]したことはない => It's better if A, it's better if it's A N1
Comparison/ Exchange
[中心「ちゅうしん」]に => With A as the center N2
Miscellaneous
たち => Plural form N5
Amount
がちです/がちになる => A tends to become/happen/occur N2
Potential, Possibility
うち/ないうち => While A is the case, B; While A is occuring, B, While A is not occuring, B N3
Conditional, While
ないと,なくちゃ => Must do A N3
Needs, Requirement
に[違「ちが」]いない => Without a doubt, A N2
Information, Report
か~ないかのうちに => Right after A, C N2
Time, Situation
[最中「さいちゅう」] => In the middle of A N3
Time, Situation
と、と、どちらが~ => Which is more C, A or B N4
Comparisons
し(~し) => and ... N4
Cause and Effect
ちなみに => A. and/in addition/by the way, B (a little more information) N2
Information, Report