やすい => A is easy to do N4
Verb Suffixes
や、やいなや => As soon as A, B N1
Time, Situation
やら~やら => A, B, ... (examples from a list) N2
Lists, Examples
てやまない => To (always) think/feel/hope/etc. A N1
Will, Decision, Doing
やる => Give B to A N4
Give and take advice
てやる => Do for someone N4
Give and take advice
ずにはすまない/ないではすまない => A must be done N1
Potential, Possibility
が[早「はや」]いか => As soon as A occurred, right after A N1
Time, Situation
と[思「おも」]いきや => Even though A (was thought/expected), different result B N1
Contrast/Surprise
[極「きわ」]み/[極「きわ」]まりない => Extremely A N1
Degree/ Level/Amount
ござる/ございます => Have~ N4
Honorifics
させて[頂「いただ」]きます/させてもらいます => Allow me to A N1
Miscellaneous