英语两动词并列时的过去式应怎样变?

问题描述:

英语两动词并列时的过去式应怎样变?
比如:When little Tom saw his mother,he stopped ( )哭泣.这时候是cry还是cried 是不是全部都一样的?最好说具体点...

stop doing sth 所以填crying