这句话英语语法正确吗?

问题描述:

这句话英语语法正确吗?
Alice Walker considered that black women can enjoy equal right with men only when they change their attitudes and values and dare to start a new life.这句话语法正确吗?
应该怎么改?

considered为过去时,至少后面引导的宾语从句中的动词can,change,dare 应该用过去式,即could,changed,dared