1、We are convinced of his willingness and ability to do anything.
只有改成ability，才与his有联系，of后面是名词短语。to表目的
2、He stood in the rain,cold and wet.
cold与wet是平行结构，都应该是同样的形式，形容词
3、Walk into the school,and you will see the teaching building.
不知道你们学过没有，祈使句的句型是 动