Question

英语语法求救

1，The students decided to do what they can help the poor old man.
这里是在help前面加to吧？课有些解释不清楚，求高手分析指教,
2，The chinese girl speaks English smoothly as though she is a native speaker.
这里面说改is为were 我可有点判断不出他用虚拟的原因啊
求分析
谢谢

Answer 1

1.can/would/will/may 等情态动词后直接跟动词原形
2.这里不是虚拟，只是比喻，前面主句是什么时态从句就跟什么时态。