1.Do cartoons always end in a happy way?卡通片常以快乐的方式结束吗?
in a ... way表示“以一种...的方式”。e.g. He talked about it in a similar way.
他对此事有相似的说法。

2.It's time to watch a cartoon.是时候看卡通片了。
I's time to do sth.表示“该做某事的时候了”。
It's time for sth./doing sth.表示“该做某事的时候了”。
e.g. It's time to have breakfast.
=It's time for breakfast/ having breakfast.该吃早饭了。

3. He can fly through the sky and fight badpeople.他能在空中飞并且打败坏人。fight v. (fought, fought)与..…战斗
n.战斗;斗争
fight sb.“和某人打仗”fight for sth.“为...打仗”
e.g. Let's fight poverty and disease together.
让我们一起克服贫困和疾病。

4. He keeps fighting bad people.他坚持和坏人作斗争。
keep doing sth.“坚持做某事”。
e.g. We must keep learning English every day.
我们必须坚持每天学英语。
5. l can't help laughing when I watch them.我看这些总禁不住大笑。
can't help doing sth.“禁不住做某事”。
e.g. The boy can't help crying when he knows what is
happening.
当男孩知道发生了什么的时候禁不住地哭了。