英语谚语A Friend in need...和 You can lead a horse to water.不要中文

A Friend in need , is a friend indeed !
(If you want to make friends,you should find those who would give you a hand while you are in predicament)
You can lead a horse to water,but you can make it drink .
(sometimes,someone gives you a chance, but you lost it)

先将你的句子写正确了：
A friend in need is a friend indeed.
You can lead a horse to water, but you can't make it drink.
这两个句子都很简单，第一个是简单句，第二个是并列句，理解起来应该没有问题，不知道你为什么还需要用英语解释给外国人听。是老师布置给你的作业吗？
第一句话...

1 When you need help, the person comes to help you will be your true friend. If a person always asks you to do things for him, but when you are in trouble , he will run away. He is not your friend.

1.A friend who can share your difficulty is your real friend.
2.No one can let someone do something that he do not want to do.