crying because of happiness
幸せで泣く (shiawase de naku)
"She shed tears of joy when her son returned home."
"彼女は息子が家に帰ったとき、喜びの涙を流した。" (Kanojo wa musuko ga ie ni kaetta toki, **yorokobi no namida** o nagashita.)
to feel like you are about to cry because of strong emotions
to think in an unconventional or creative way
Expressing one’s personal view or opinion
to look very happy or pleased
to take responsibility for someone and help them learn
to take on a task that is too difficult