父は時間を無駄にしない。
tbd
My father doesn't waste his time.
My father makes good use of his time.
My father is economical of his time.
は
1. indicates sentence topic
2. indicates contrast with another option (stated or unstated)
3. adds emphasis
指示句子的主题;表示与另一选项(无论是否明确提及)形成对比;表示强调