1. "Boys" refers to young males or young men (plural form of "boy").2. The phrase "boys and girls" refers to children, both boys and girls.3. "Boys will be boys" is an expression that means boys will always act like boys, indicating that certain behaviors are inherent to boys.4. Here are some example sentences using "boys": - Put all the boys to work. (讓所有的男孩子們去工作。) - Girls spring up faster than boys before 18. (18歲之前，女孩子的成長速度比男孩子快。) - Some boys make up to their teachers to get good marks. (有些男孩為了得到好成績而對老師撒謊。) - Not only do teachers praise her, girls admire her, but boys love her as well. (不僅老師們稱贊她，女孩子們也欽佩她，男孩子們也喜愛她。) - Some boys smoke on the sly. (有些男孩子偷偷吸煙。)