understand doing

understand to do 还是 understand doing 还是 understand do? If I understand what is love ,it is you doing . do you understand what l mean by doing this What are people who understand "the difference" doing right understand Understand? 求助英语帝……有没有understand sb doing sth的用法呢 及lead to sb doing sth you (understand) what l (mean) by doing this?空格中填什么词? understand 意思 understand t. understand是什么意思 understand是什么意思?