"There is/are ..... and ...... ." "Some ....., some others ....."
There are good days and bad days.
Some people like their food sweet, some others like it hot.
There is/are ....... and .......
-> xxもあれば、xxもある
Some ......., some others...... .
-> xxという人もいれば、xxという人もいる
Sometimes I'm tired, sometimes I'm not.
There is good and evil.
There are true friends, and there are friends with interests only.
Some wars were predictable, some others unpredictable.
Some men act like women, some others like children.
アドリブで考えた例ですが、
アイデアをつかんでいただけますでしょうか^^