help 的非谓语形式：
1、动词不定式to help
2、动名词helping
3、动词的
过去分词helped
help的谓语形式：
1、动词原形help
I often help the young cross the street.我经常帮助小孩过马路。
2、动词的过去式helped
He helped me with my English yesterday.
他昨天帮我学英语。
3、动词的
现在分词helping
He is helping the young cross the road.他正在帮助小孩过马路。
4、动词的三单helps
He helps the young cross the street,他帮助小孩过马路。