为你解答.
1、你可以给他打电话告诉他你的想法.
You could （call him up） to tell him your idea.
2、我不知道如何关心动物.
I don't know （how to care for） animals.
3、她五岁的时候开始学习打棒球.
She began to learn to play baseball （at the age of） five.
4、她非常高兴,因为她可以做她喜爱的事情.
She is very happy because she can do （whatever she likes to do）.
5、她将自愿帮助我们举办一词图书特卖活动.
She will （volunteer to help） us have a book sale.